Yes. If you use force — including deadly force — to defend yourself or someone else, you can be arrested, charged, and sentenced to prison, even if you genuinely believed you had no other choice. That is because self-defense is not an exception from the criminal justice system. It is a legal defense raised after the State files charges. Its success depends entirely on whether the facts meet a specific set of requirements under Illinois law.
This page covers what Illinois law actually requires for a self-defense claim to hold up and why prosecutors charge people who believed they were defending themselves. It also explains what happens when a self-defense claim is only partially successful, and what someone facing this situation should know right now.
Why Would the Prosecutor Charge You If It Was Self-Defense?
When someone is killed or seriously injured, law enforcement and prosecutors start from the outcome and work backward. A person is dead. Someone caused that death. The State’s job is to determine whether that killing was legally justified. If the answer isn’t obvious from the evidence, charges get filed so the question can be resolved in court.
This is where the gap between expectation and reality hits hardest. Most people assume that if they were genuinely defending themselves, the system will recognize that early and leave them alone. But prosecutors are not evaluating whether you were scared or whether the other person was dangerous. They are evaluating whether the force you used meets every element of a legal standard. If they believe they can argue that even one element fails, they will charge.
The numbers make the stakes clear. In Cook County, the State’s Attorney’s Office has approved 82% of all felony cases presented for prosecution. Nationally, 70% of defendants charged with murder in large urban counties are convicted of a felony. Once the charging decision is made, the machinery moves forward. The burden shifts to the defense to prove that the killing was justified. The place where self-defense succeeds or fails is not the moment of the confrontation. It is the courtroom.
What Does Illinois Law Actually Require for Self-Defense to Work?
Under 720 ILCS 5/7-1(a), a person is justified in using force when they reasonably believe that force is necessary to defend themselves or another person against someone else’s imminent use of unlawful force. But deadly force — force intended or likely to cause death or great bodily harm — is justified only when the person reasonably believes it is necessary to prevent imminent death, great bodily harm, or committing a forcible felony.
Every word in that standard carries weight, and a self-defense claim can fail if any single component is missing.
Reasonable belief. Illinois applies a two-part test. First, did the defendant actually believe force was necessary? That is the subjective part. Second, would a reasonable person in the defendant’s position have held the same belief? That is the objective part. A genuine fear that does not hold up under the objective standard is not enough for a complete defense. It may matter in a different way, though, addressed below.
Imminence. The threat must be happening or about to happen. Force used in response to a past threat, a future concern, or a situation that had already ended does not qualify. Illinois law protects people who are responding to danger in the moment, not people who act preemptively or in retaliation.
Proportionality. The level of force must match the level of threat. Deadly force is only justified against a deadly threat or committing a forcible felony. Using a weapon against an unarmed person who posed no risk of death or great bodily harm will weaken the claim, even if the confrontation was real.
When a defendant raises self-defense at trial, the State must disprove at least one of these elements beyond a reasonable doubt. The defense does not have to prove it was self-defense — the prosecution has to prove it was not. But as the Illinois Supreme Court made clear in People v. Jeffries, that only helps if the facts actually support the claim. If the evidence on imminence is weak, or the force was disproportionate, or the belief was unreasonable, the State has a real path to conviction.
Does Illinois Require You to Retreat Before Using Force?
Illinois does not have a stand-your-ground statute. Some states explicitly allow a person to meet force with force wherever they are legally present. Illinois does not. It imposes a general duty to retreat in public spaces. If you had a safe way to escape and did not take it, that failure to retreat can be used to argue that force was not necessary. And necessity is a core element of the defense.
This is one of the most common reasons otherwise sympathetic self-defense claims run into trouble. The confrontation may have been real, and the threat may have been genuine. But if there was a door, a street, or a clear path away, the prosecution will ask why you didn’t use it.
The duty to retreat is not absolute. It applies in public. You do not have to take an escape route that would put you in additional danger.
What Happens If a Jury Thinks Your Self-Defense Claim Was Unreasonable?
This is where a legal concept most people have never heard of becomes very important. Illinois recognizes what is called imperfect self-defense under 720 ILCS 5/9-2(a)(2). It applies when you genuinely believed deadly force was necessary — you were not making up the claim — but a jury concludes that your belief was not objectively reasonable.
In that scenario, you are not acquitted. But the charge is not treated as first-degree murder either. First-degree murder can be reduced to second-degree murder, a Class 1 felony. That carries 4 to 20 years. First-degree murder, by contrast, carries 20 to 60 years — served at 100% under Truth-in-Sentencing.
The Illinois Supreme Court addressed this directly in People v. Washington: when evidence at trial supports a self-defense claim, the jury must also be instructed on second-degree murder based on imperfect self-defense. The jury then decides whether the defendant’s belief was objectively reasonable (acquittal) or unreasonable (second-degree murder). That means the jury is specifically asked to evaluate the quality of your judgment in the moment. How the evidence is presented on that question often determines the outcome.
You bear the burden of proving the imperfect self-defense mitigating factor by a preponderance of the evidence. That is a lower bar than beyond a reasonable doubt, but it still requires actual proof. The difference between a complete self-defense acquittal and a second-degree murder conviction frequently comes down to how effectively the defense builds the case for reasonableness.
What Should You Do Right Now If You’re Facing Charges After Defending Yourself?
Every self-defense case turns on its specific facts — the sequence of events, the physical evidence, the witnesses, the 911 calls, the location, the relative positions and sizes of the people involved, whether retreat was possible, and dozens of other details that shape whether the legal standard is met. The difference between an acquittal, a reduced charge, and a first-degree murder conviction is not whether self-defense “happened.” It is whether the defense can prove, through evidence, that every element of the legal standard was satisfied — or at minimum, that the State cannot disprove it beyond a reasonable doubt.
That work starts immediately. Evidence disappears. Surveillance footage gets recorded over. Witnesses’ memories shift. The earlier a defense attorney is involved, the more there is to work with.
At DRD Law in Chicago, attorney David R. Drwencke has handled 565+ criminal defense cases and built his practice around an evidence-based defense philosophy — identifying, preserving, and presenting the facts that determine how a case resolves. His 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, gave him direct insight into how judges think and rule. If you are facing charges after using force to protect yourself or someone else, that experience matters.
Contact DRD Law for a consultation about your case.
