Police revealed on Friday that 38-year-old Jimmy Lam used two stolen guns to shoot and kill three of his UPS colleagues on June 14 in San Francisco.
While it's unclear how he obtained the firearms, Lam used an assault pistol that was stolen in Utah and a semi-automatic handgun from Napa County, California. Lam's crime, according to Police Commander Greg McEachern, “appeared purposeful and targeted,” although his motive is still unknown, according to the Associated Press.
Lam shot employees near the UPS San Francisco Customer Center before ending his own life in front of police. He reportedly struggled with depression and appeared troubled before the shooting but, according to police, was completely silent during his massacre.
According to AP, an official with San Francisco's police department indicated that Lam felt disrespect from his co-workers.