Texas defense of a third person — Penal Code § 9.33

Defense of a third person under Penal Code § 9.33 lets you use force — even deadly force — to protect someone else when you reasonably believe that person would be justified in defending themselves and that your intervention is immediately necessary. It is a justification the State must disprove beyond a reasonable doubt once you raise it.

What § 9.33 means — stepping into another person's shoes

Texas law lets you act for someone else. Section 9.33 justifies using force — or deadly force — to protect a third person, measured by the same rules that would let that person defend themselves. The controlling question is what you reasonably believed at the moment, not what later proved to be true.

Chapter 9 of the Penal Code collects Texas's justification defenses, and § 9.02 says that conduct which is justified under the chapter is a defense to prosecution. Defense of a third person is the outward-facing branch of self-defense. It has two moving parts: first, under the circumstances as you reasonably believe them to be, the person you are protecting must appear entitled to use force or deadly force under § 9.31 or § 9.32; and second, you must reasonably believe your intervention is immediately necessary to protect them.

The person you protect can be almost anyone. Section 9.33 draws no relationship line — a spouse, a child, a co-worker, or a complete stranger all count. The Texas Court of Criminal Appeals has read the statute to place the intervenor “in the shoes of the third person,” so that so long as you reasonably believe the third person would be justified in defending themselves, you may step in and use the force they could lawfully have used on their own behalf.[1]

That “shoes” idea sets the ceiling on how far you can go. If the person you protected could only have used ordinary, non-deadly force, then so can you. If their situation would have justified deadly force under § 9.32 — because they faced unlawful deadly force, or an imminent aggravated kidnapping, murder, sexual assault, robbery, or aggravated robbery — then deadly force on their behalf is on the table. You cannot lawfully use more force to defend them than they could have used to defend themselves.

Defense of others vs. self-defense vs. defense of property

The three protective justifications share the same DNA but differ in who and what they cover. Self-defense (§ 9.31) protects you; defense of others (§ 9.33) protects another person through their eyes; and defense of property (§§ 9.41–9.43) protects things and allows deadly force only in narrow, statute-specified situations. The table lines them up.

This page covers § 9.33 only. For the full mechanics of protecting yourself — the presumptions of reasonableness, the “stand your ground” no-duty-to-retreat rule, and how provocation cuts off the defense — see our dedicated guide to Texas self-defense under § 9.31. For the property branch, see defense of property under §§ 9.41–9.43. The rest of this page stays with the person-protecting-a-person scenario.

The elements the evidence must raise

To put § 9.33 in front of a jury, the evidence has to touch each element: an unlawful threat to the third person, your reasonable belief that the person could have defended themselves, your reasonable belief that immediate intervention was necessary, and force no greater than the threat. Here is the statute, then the element-by-element breakdown.

1. An unlawful threat to the third person

There must be unlawful force, or unlawful deadly force, that you reasonably believe is threatening the person you protect. Lawful force — a police officer making a lawful arrest, or someone else lawfully defending themselves — does not qualify. You cannot “defend” an aggressor from a lawful response.

2. Circumstances as you reasonably believed them

The statute is expressly framed around your reasonable belief. A “reasonable belief” under § 1.07(a)(42) is one an ordinary and prudent person would hold in the same situation. Your belief can be reasonable even if it later turns out to be mistaken about the facts.

3. The third person's own apparent right to defend

You are only as justified as the person you protect would have been. Ask whether, on the facts as you reasonably saw them, that person could have used the same level of force under § 9.31 (force) or § 9.32 (deadly force). If they could not, neither can you.

4. Immediate necessity of intervention

You must reasonably believe that stepping in was immediately necessary — force needed at that moment, when a split-second decision is required. A concern about harm that might happen later does not satisfy this element.

5. Proportional degree of force

Force is justified only “to the degree” reasonably believed necessary. Deadly force is reserved for the deadly-force situations described in § 9.32. Answering a shove with a firearm, or continuing to strike after the threat has ended, pushes conduct outside the justification.

Who carries the burden of proof

This distinction decides cases. Defense of a third person is a § 2.03 defense, not a § 2.04 affirmative defense. You are never required to prove it. Once some evidence raises the issue, the burden sits on the State to disprove the justification beyond a reasonable doubt, and the jury is charged accordingly.

Mechanically, it works like this. The defendant produces some evidence on each element of § 9.33. The trial judge then instructs the jury on the defense — and a Texas court reviews that evidence in the light most favorable to the defendant, so the instruction is required even when the supporting evidence is weak, contradicted, or of doubtful credibility.[4] The jury is told that if it finds the conduct was justified, or if it has a reasonable doubt about whether the conduct was justified, it must acquit. The State does not have to disprove the defense until it has been raised, but once it is in the case, disproving it becomes part of the State's burden of proving guilt beyond a reasonable doubt.

Contrast that with affirmative defenses such as insanity or duress, which § 2.04 puts on the defendant to prove by a preponderance of the evidence. Defense of others is not one of those. Getting this classification right on the record — and securing the correct jury charge — is often the difference between a defense the jury may weigh and one it never hears about.

How Texas courts have interpreted § 9.33

Four decisions frame the defense. Hughes built the “step into the shoes” rule, Morales fixed the focus on the actor's reasonable belief even when it is mistaken, Henley drew the hard line at immediate danger, and Estrada restated when a trial judge must give the instruction. Each is a real, published Texas opinion.

Hughes v. State (Tex. Crim. App. 1986) is the foundation. Reading § 9.33, the Court of Criminal Appeals explained that the Legislature was “merely placing the accused … in the shoes of the third person,” so that “so long as the accused reasonably believes that the third person would be justified in using deadly force to protect himself, the accused may step in and exercise deadly force on behalf of that person.” The Court held the intervenor need not be personally in danger, and that any question of retreat is measured from the third person's standpoint, not the intervenor's.[1]

Morales v. State (Tex. Crim. App. 2011) sharpened the focus. The Court held that “the focus of the defense-of-third-persons defense is upon what the actor reasonably believes concerning the situation of the third person.” Crucially, it explained that if the defendant reasonably believed the person he protected was acting in legitimate self-defense, he would be entitled to the defense “even if [his] belief was actually incorrect.” It is your reasonable perception, not the third person's actual legal right, that controls.[2]

Henley v. State (Tex. Crim. App. 2016) marks the outer limit. The Court reaffirmed the § 9.33 standard and stressed immediacy: “To be justified in using force to protect a third person, the third person had to have been in immediate danger. An imagined future scenario is not enough.” Force must be needed “at that moment — when a split second decision is required,” so a defendant's anticipation that harm might come later does not fit the justification.[3]

Estrada v. State (Tex. App.—Beaumont 2025) applied those rules to the jury charge. The court restated that a “trial court errs by refusing a defense of third person instruction if there is some evidence, viewed in the light most favorable to the defendant, that will support its elements” — but affirmed a refusal where “there is no evidence that the victim was making an attack or threatening an immediate attack upon a third party,” because on those facts the issue is simply not raised.[4]

When defense of others does not apply

The defense has real edges. It fails when the danger was only feared for the future, when the person you “protected” was actually the aggressor and you knew it, when your force outran the threat, or when nothing in the record shows the victim was attacking anyone. Provocation and your own conduct can also strip the justification.

• Anticipated future harm. Under Henley, worry about what someone might do later is not enough. The threat to the third person has to be immediate, calling for force at that moment.
• No evidence of an attack. Under Estrada, if there is no evidence the complainant was attacking or threatening an immediate attack on the third person, the issue is not raised and no instruction is warranted.
• Defending a known aggressor. Because you stand in the third person's shoes, you get no more rights than they had. If you knew the person you helped was the first aggressor or was committing a robbery, there is no lawful self-defense for you to borrow.
• Disproportionate force. Force is justified only to the degree reasonably necessary. Deadly force in answer to a non-deadly threat, or force that continues after the danger has passed, falls outside § 9.33.
• Provocation and criminal activity. Justification can be weakened or lost where you provoked the confrontation, and some deadly-force presumptions do not apply if you were engaged in criminal activity beyond a Class C traffic offense at the time.
• Lawful force is not “unlawful force.” You cannot use § 9.33 to intervene against a peace officer's lawful arrest or against a person who is themselves lawfully defending against your friend.

Whether the facts of a given incident land inside or outside these limits is rarely obvious in the moment, which is why the analysis belongs with a lawyer who can map what you actually perceived onto the statute and the case law.