San Francisco police on Friday released an image of Jimmy Lam, the man they said gunned down three fellow UPS employees at a Potrero Hill warehouse June 14 before turning the gun on himself. (Jessica Christian/S.F. Examiner)

San Francisco police on Friday released an image of Jimmy Lam, the man they said gunned down three fellow UPS employees at a Potrero Hill warehouse June 14 before turning the gun on himself. (Jessica Christian/S.F. Examiner)

Police release images of suspect, guns used in killings of UPS employees

It remains unclear what motivated the man who opened fire at a UPS facility last week, killing three colleagues before turning the gun on himself, but police said Friday that it appears the victims were targeted.

San Francisco police Cmdr. Greg McEachern said UPS employee Jimmy Lam, 38, had two stolen guns on him at the Potrero Hill warehouse where the shooting occurred, a MAC-10 with an illegal 30-round clip, which he used in the killing, and an automatic pistol.

“At this time we have not established a motive,” said McEachern, who added that the killings were “purposeful and targeted.”

At a news conference at police headquarters Friday afternoon, police displayed images of Lam’s automatic weapon as well as his face, which until now has not been widely disseminated.

SEE RELATED: Victims of UPS shooting mourned, company disputes claims of ‘hostile’ work environment

Witnesses said Lam walked into a meeting at about 9 a.m. June 14 at the UPS facility at 320 San Bruno Ave. and targeted three colleagues. After police arrived Lam shot himself dead.

In all, Lam fired 20 rounds in the rampage, injuring two people in addition to those he killed.

SEE RELATED: Eyewitnesses recall deadly UPS shooting rampage

One of the guns was stolen in Utah and the other in Napa, authorities said. Police also searched Lam’s home and seized computers, cellphones and a journal they are reviewing.

None of the incident was caught on video surveillance but officers who approached Lam before he shot himself in the head had their body cameras activated.

The shooting left four UPS workers dead, including Lam: Benson Louie, 50, Wayne Chan, 56, and Mike Lefiti, 46.

All the men who died in the incident lived in San Francisco except for Lefiti, who was a Hercules resident.

Representatives from Teamsters Local 2785 and several UPS employees said the workplace was a tense, stressful place where management and staff often were in conflict, though UPS has disputed those claims.

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