Gunman who killed 3 co-workers at UPS had filed grievance over excessive overtime

SAN FRANCISCO (AP) —  A union official says the gunman who shot and killed three people at a UPS warehouse in San Francisco had filed a grievance complaining that he was working excessive overtime.

San Francisco's chief medical examiner identified the victims as 50-year-old Benson Louie and 56-year-old Wayne Chan, both of San Francisco; and 46-year-old Michael Lefiti, of Hercules, Calif.

Police say the three UPS drivers were killed by 38-year-old Jimmy Lam, who fatally shot himself in the head in front of officers.

Joseph Cilia, an official with a local Teamsters Union, says Jimmy Lam's grievance filed in March requested that UPS relieve him of working overtime going forward.

Still, Cilia says Lam, a UPS driver, wasn't angry, and he could not understand why he would open fire on his colleagues at a morning meeting on Wednesday.

Cilia says Lam targeted three fellow UPS drivers. Cilia says two other drivers who were wounded have been released from the hospital and will be OK.