SUNNYVALE, Calif. — A man described as a disgruntled employee who opened fire on his co-workers at a California limestone quarry was shot and killed by deputies Thursday, bringing an end to a heavily armed manhunt in Silicon Valley.

Three deputies on routine patrol in a Sunnyvale neighborhood encountered the man, identified by a coroner’s investigator as Shareef Allman, around 7:30 a.m., Santa Clara County Sheriff Laurie Smith said. He was crouched behind a vehicle in the driveway of a home.

Thursday’s shooting took place in a residential area about 5 miles east of the Lehigh Southwest Cement Permanente Plant in Cupertino, where Allman allegedly opened fire during a routine safety meeting on Wednesday. Three people died and six were wounded.