Santa Ana police on Sunday night shot and killed a crazed teen armed with a knife — after a bizarre attack that left the teen’s mother injured and her boyfriend with stab wounds. The incident began around 10:30 p.m. when a 53-year-old man called police and said his girlfriend’s son was high or drunk, vandalizing property inside their apartment and had stabbed him with a knife, a press release issued by the Santa Ana Police Department said. Officers responded to the man’s residence at 3400 S.