California, United States of America
The following excerpt is from People v. De Leon, 10 Cal.App.4th 815, 12 Cal.Rptr.2d 825 (Cal. App. 1992):
If there was substantial evidence of imperfect self-defense not inconsistent with the defense theory of the case, the trial court had a sua sponte duty to give such an instruction. (People v. Wickersham (1982) 32 Cal.3d 307, 326, 185 Cal.Rptr. 436, 650 P.2d 311.) Here, there is no issue concerning "not inconsistent with the defense theory of the case."
Also not in issue is the legal significance of the defendant not testifying. Substantial evidence of a defendant's state of mind, including an "honest but unreasonable belief in the necessity to defend against imminent peril to life" (CALJIC No. 5.17), may be present without defendant testimony. (People v. Castillo (1987) 193 Cal.App.3d 119, 126, 238 Cal.Rptr. 207; People v. Anderson (1983) 144 Cal.App.3d 55, 62, 192 Cal.Rptr. 409.)
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