Technology executive Bob Lee's accused killer told a jury he acted in self-defense after Lee tried to attack him with a knife on a San Francisco street a year and a half ago, saying "he went crazy on me" after losing his temper.

Technology executive Bob Lee's accused killer told a jury he acted in self-defense after Lee tried to attack him with a knife on a San Francisco street a year and a half ago, saying "he went crazy on me" after losing his temper.