California Use of Deadly Force Standards

California law establishes specific standards for when deadly force may be used in self-defense. These standards are codified primarily in Penal Code Sections 197 through 199^[1] and interpreted through the CALCRIM jury instructions that guide juries in evaluating self-defense claims.

Penal Code Section 197: Justifiable Homicide

Section 197 defines justifiable homicide by "any person" in several circumstances^[1]:

• When resisting any attempt to murder any person, or to commit a felony, or to do some great bodily injury upon any person
• When committed in defense of habitation, property, or person, against one who manifestly intends or endeavors to commit a felony by violence or surprise
• When committed in the lawful defense of the slayer or any other person when there is reasonable ground to apprehend a design on the part of the person slain to commit a felony or to do some great bodily injury, and there is imminent danger of such design being accomplished

CALCRIM 505: Self-Defense (Justifiable Homicide)

The CALCRIM 505 jury instruction^[2] is the primary instruction given to juries in homicide cases where self-defense is raised. It instructs jurors that the defendant acted in lawful self-defense or defense of another if the defendant reasonably believed that they or someone else were in imminent danger of being killed, suffering great bodily injury, or being a victim of a forcible and atrocious crime such as rape or mayhem, reasonably believed that immediate deadly force was necessary to defend against that danger, and used no more force than was reasonably necessary.

CALCRIM 506 Defense Within the Home

CALCRIM 506^[3] addresses defending oneself or another person in the defendant's home against a forcible and atrocious crime or a violent entry intended to commit violence against someone inside. It requires reasonable beliefs that the danger was imminent and deadly force was necessary, and no more force than was reasonably necessary.

Reasonable Belief Standard

California uses an objective-subjective hybrid standard. The defendant must have actually believed they were in danger (subjective), and a reasonable person in the same circumstances would have shared that belief (objective). The circumstances considered include what the defendant knew at the time, the relative physical capabilities of the parties, and relevant past threats or violence, including threats or harm to the defendant, known threats or harm to others, and threats the defendant reasonably associated with the aggressor. The jury evaluates reasonableness from the perspective of a reasonable person in the defendant's position.

Imminent Danger

The danger must be imminent, meaning it actually existed or the defendant reasonably believed it existed when force was used and it seemed immediate and present. A future threat or a past threat that has subsided does not justify deadly force. Penal Code Section 198 provides that a bare fear of death or great bodily harm is not sufficient to justify homicide^[4]. The circumstances must be sufficient to excite the fears of a reasonable person, and the person must act under the influence of such fears alone.

Proportionality of Force

In self-defense or defense of another, deadly force may be justified by a reasonable belief in imminent danger of death, great bodily injury, or a forcible and atrocious crime, together with a reasonable belief that immediate deadly force is necessary and use of no more force than reasonably necessary. A threat of minor harm or property damage alone does not justify deadly force. Using more force than reasonably necessary under these circumstances is not justified and can result in criminal prosecution. Penal Code Section 199 provides that the justification of homicide requires full investigation of the circumstances^[5].

Imperfect Self-Defense

If a defendant actually believed they were in danger but that belief was unreasonable, California recognizes "imperfect self-defense." This does not acquit the defendant but reduces murder to voluntary manslaughter. CALCRIM 571 governs this instruction. The defendant still faces criminal liability, but at a significantly reduced level.

Initial Aggressor

A person who initiates a confrontation generally cannot claim self-defense. However, if the initial aggressor withdraws from the fight and communicates that withdrawal, and the other party continues the attack, the initial aggressor may regain the right to self-defense.