Whether the State proved Grant's sanity beyond a reasonable doubt after evidence raised the insanity defense.
Holding
Yes. The jury's finding that Grant was sane was not manifestly against the weight of the evidence.
Reasoning
Illinois initially presumes a defendant sane, but the presumption disappears once evidence creates a reasonable doubt about sanity. At that point, the State must prove sanity beyond a reasonable doubt. Still, a reviewing court will not overturn the jury's sanity finding unless the verdict is so contrary to the evidence that it appears to rest on passion or prejudice.
The jury was not required to accept Dr. Ludin's conclusion that Grant had a psychomotor seizure during the attack. The weight of psychiatric testimony depends on the factual basis supporting it, and Dr. Ludin acknowledged that his opinion would change if Grant's account were untrue.
The record supplied reasons to doubt Grant's claimed blackout. A doctor reported that Grant was alert and in touch with reality the day after the incident; Officer Yarcho testified that Grant was alert, coherent, and apparently possessed his normal faculties at arrest; and Grant gave appropriate answers about his personal history.
Although Grant's resistance during arrest was consistent in some respects with the expert's description of psychomotor seizure behavior, it was also weaker than his resistance during the later jail incident. The later grand mal seizure did not establish that Grant necessarily had experienced a psychomotor seizure during the earlier attack. The jury could therefore find sanity beyond a reasonable doubt.