I thought I was defending myself — so why am I being charged with murder?
If you or someone you care about used deadly force believing it was necessary for protection, but the State is still pressing a murder charge, the reason almost always comes down to one legal distinction. Illinois law separates actually believing you needed to defend yourself from whether that belief was objectively reasonable. When a court finds that the belief was real but that a reasonable person in the same position wouldn’t have reached the same conclusion, a full self-defense claim fails. That does not mean, however, that the law ignores the fact that the fear was genuine.
Illinois recognizes a doctrine called imperfect self-defense, and it exists precisely for this situation. It cannot produce a not guilty verdict, but it can reduce a first-degree murder charge to second-degree murder — a difference that, in sentencing terms, can mean decades. The rest of this page explains what imperfect self-defense is under Illinois law, how it changes the charge and the sentence, what kind of evidence supports it, where its limits are, and why the attorney handling the case determines whether this defense ever gets raised at all.
What is imperfect self-defense under Illinois law?
Under 720 ILCS 5/9-2(a)(2), a person who kills another while holding an actual but objectively unreasonable belief that deadly force was justified may have a first-degree murder charge reduced to second-degree murder. That statute has two parts, and both must be present.
The first is subjective: the person genuinely believed, at the moment they acted, that using deadly force was necessary to prevent imminent death or great bodily harm. This is about what was happening inside their mind — their real perception of danger, not a calculation made after the fact.
The second is objective: that belief, measured against what a reasonable person in the same circumstances would have concluded, was not reasonable. If the belief passes both tests — real and reasonable — the killing is justified under full self-defense (720 ILCS 5/7-1), and no crime occurred. Imperfect self-defense applies when the fear was genuine but the legal system concludes it didn’t meet the objective standard.
Illinois courts have made clear that these two questions are inseparable at trial. In People v. Washington (2012 IL 110283), the Illinois Supreme Court held that when evidence supports a self-defense instruction, the jury must also be instructed on second-degree murder based on imperfect self-defense. The jury then decides whether the subjective belief was objectively reasonable or unreasonable. Imperfect self-defense is not a lesser argument a defense attorney settles for. It is a mandatory companion to any self-defense claim. Failing to raise it properly can leave the most powerful mitigation tool on the table.
What does imperfect self-defense actually do to the charge?
It converts a first-degree murder conviction into a second-degree murder conviction. That distinction matters enormously, but the process behind it is unusual in Illinois, and understanding it is important.
Second-degree murder is not a standalone criminal charge in Illinois. A prosecutor cannot file a second-degree murder charge on their own. Instead, the State must first prove every element of first-degree murder beyond a reasonable doubt. That means proving you killed without lawful justification while acting with intent to kill or do great bodily harm, or with knowledge that your acts would cause or create a strong probability of death (720 ILCS 5/9-1(a)(1)–(2)). Only after the State meets that burden does the question of mitigation arise.
At that point, the burden shifts. You must prove, by a preponderance of the evidence, that you held an actual but unreasonable belief that the use of deadly force was justified. A preponderance of the evidence is a lower standard than the State’s burden. It means “more likely than not” rather than “beyond a reasonable doubt.” But the responsibility falls entirely on the defense. The Illinois Supreme Court upheld this burden-shifting process as constitutional in People v. Jeffries (164 Ill. 2d 104, 1995), confirming that requiring the defendant to prove a mitigating factor does not violate due process.
If you meet that burden, the conviction enters as second-degree murder rather than first-degree murder. The underlying actions are the same. The facts don’t change. But the legal classification — and everything that follows from it — changes dramatically.
How much does the sentence actually change?
This is where the doctrine’s real weight becomes visible.
First-degree murder is classified as a Class M felony in Illinois. It carries a sentencing range of 20 to 60 years. Extended terms reach 60 to 100 years, and natural life imprisonment applies in aggravated cases (730 ILCS 5/5-4.5-20). Under Illinois truth-in-sentencing law (730 ILCS 5/3-6-3), a person convicted of first-degree murder must serve 100 percent of their court-imposed sentence with no good-conduct credit. The average sentence for first-degree murder in recent years is 38.3 years, every day of which must be served. Mandatory firearm enhancements can push effective sentences even higher: a defendant who personally discharged a firearm causing death or great bodily harm faces a minimum of 45 years.
Second-degree murder is a Class 1 felony carrying 4 to 20 years. A person convicted of second-degree murder serves their sentence at approximately 50 percent with day-for-day good-conduct credit. Probation is even a legal possibility, though not guaranteed — something that is entirely unavailable for first-degree murder.
Placed side by side: a first-degree murder conviction with a 38-year sentence means 38 years in prison. A second-degree murder conviction with a 10-year sentence could mean roughly 5 years served. The difference between these outcomes is not small. It is the difference between losing most of a life to incarceration and having a future outside of it. Imperfect self-defense is the legal mechanism that moves a case from one column to the other.
What kind of evidence supports an imperfect self-defense claim?
Because the defense must prove that you genuinely believed deadly force was necessary, the evidence centers on what you knew and perceived at the time of the killing — and why that perception, even if ultimately unreasonable, was real.
One of the most significant categories of evidence is the victim’s history of violence. In People v. Lynch (104 Ill. 2d 194, 1984), the Illinois Supreme Court held that evidence of the victim’s aggressive and violent character is admissible in two distinct ways. If you knew about the victim’s violent history, it affects the reasonableness of your perceptions. Regardless of your knowledge, it supports your version of disputed facts about who was the aggressor.
Beyond the victim’s history, the circumstances surrounding the event itself carry weight: prior threats made by the victim, the physical details of the confrontation, whether you were in a confined space or had limited options, the relative size and strength of the parties, the presence of weapons, and any history of conflict between you and the victim. The question the jury is evaluating is not whether a calm, detached observer would have acted the same way, but whether you, with what you knew and what you were experiencing, actually believed you were in mortal danger.
This is also where the quality of investigation and preparation by the defense attorney becomes critical. Evidence that supports an imperfect self-defense claim doesn’t always surface on its own — it has to be identified, gathered, preserved, and presented in a way that makes your subjective experience understandable to a jury.
Can I lose the right to claim imperfect self-defense?
Yes. There are circumstances where the defense is unavailable, and knowing those boundaries matters.
The most significant limitation comes from the aggressor doctrine under 720 ILCS 5/7-4. If you were the initial aggressor in the encounter — the person who started the confrontation — self-defense is generally barred, and imperfect self-defense along with it. Illinois law does provide narrow exceptions. An initial aggressor may regain the right to self-defense by exhausting every reasonable means of escape when the other party’s response creates an imminent threat of death. Alternatively, the initial aggressor may withdraw from the encounter in good faith and clearly communicate the desire to disengage. But these exceptions are demanding, and whether they apply depends heavily on the specific facts.
There is also a limitation built into the statute. Imperfect self-defense can only mitigate first-degree murder charges brought under 720 ILCS 5/9-1(a)(1) (intentional killings) or 5/9-1(a)(2) (killings committed with knowledge of a strong probability of death). It cannot reduce a felony murder charge under 5/9-1(a)(3). Felony murder means the death occurred during the commission of another forcible felony. If the State is prosecuting under that theory, imperfect self-defense does not apply, regardless of what you believed at the time.
Additionally, if you were committing, attempting, or fleeing from a forcible felony at the time of the killing, you are entirely barred from raising any form of self-defense under 720 ILCS 5/7-4(a), with no exception.
These boundaries don’t diminish the power of the doctrine. They define where it operates, and an experienced defense attorney will evaluate early in a case whether imperfect self-defense is an option or whether the facts point toward a different defense strategy.
Why does the attorney I choose matter for this defense?
Imperfect self-defense does not activate automatically. It is not something a judge raises on their own or a right that attaches to a case without action. It is an affirmative mitigating factor that your defense team must raise, support with evidence, and prove by a preponderance of the evidence. At the same time, the State is arguing that your belief was either fabricated or irrelevant. If the defense attorney doesn’t assert it, build the evidence for it, and argue it effectively, the doctrine simply doesn’t enter the case. The jury never hears the instruction. The mitigation never happens.
This means the single most important factor in whether imperfect self-defense changes the outcome of a murder case is the attorney presenting it. Your defense lawyer needs to understand how Illinois structures its homicide classifications, how burden-shifting works in practice, and how judges evaluate the sufficiency of evidence supporting a mitigating factor. The difference between 720 ILCS 5/9-1 and 720 ILCS 5/9-2 is not academic. It is measured in decades.
At DRD Law in Chicago, attorney David Drwencke brings a perspective shaped by nearly seven years as a judicial law clerk to the Honorable Rudy J. Nichols in Oakland County Circuit Court, where he observed hundreds of bench and jury trials and gained insight into how judges think and rule. That experience, combined with over 565 criminal defense cases and an evidence-based defense philosophy, informs how DRD Law approaches every homicide case — including identifying and building imperfect self-defense claims. David has been named an Illinois Super Lawyers Rising Star every year from 2019 through 2026, received the Martindale-Hubbell AV Preeminent peer review rating in 2025, and was named an Elite Lawyer in 2026.
Talk to a defense attorney who knows how to use this defense
If you or someone close to you is facing a murder charge in Illinois and the facts involve a genuine belief in the need for self-defense, the window to build this defense starts now. Evidence needs to be preserved, witnesses need to be identified, and the legal strategy needs to take shape before the case moves forward without it.
DRD Law offers consultations for individuals facing homicide charges in Chicago and throughout Illinois. You can reach the firm at its office at 332 S. Michigan Avenue, Suite 900, Chicago, IL 60604, or through drdlawllc.com.
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