1. 1. Beatles frontman John Lennon died at 40 after he was shot in the back four times outside his New York City home on Monday, December 8, 1980 by Mark David Chapman, an obsessed fan who’d become the poster boy for deranged celebrity stalkers.

2. 2. Up-and-coming actress Rebecca Schaeffer (My Sister Sam) was shot and killed in 1989 at the front door of her L.A. apartment by stalker Robert John Bardo, who’d hired a private detective to gain her personal info. The next year, California passed the first anti-stalking law.