Makeshift memorials are popping up around the site of Wednesday’s tragic mass shooting at the UPS Center in Potrero Hill in which the shooter allegedly “had it out for a manager”. Police investigators are piecing together the motives of apparently disgruntled employee Jimmy Lam, who reportedly felt he was asked to work too much overtime, and took his own life after killing three colleagues.

As the UPS Customer Service Center returns to work under a very dark cloud, residents are discovering the awful news about drivers whom they loved.

“We gotta get those packages out,” solemn but dogged overnight shift loader Isaiah Miggins told KRON 4. But while the UPS workplace is obliged to attempt a return to normalcy, both drivers and those residing on the murdered drivers’ routes will find it impossible to forget the lives lost.

Slain 50-year-old driver Benson Louie is memorialized in the Chronicle as a 17-year veteran at UPS, and a volleyball coach and player who is survived by two daughters and his wife. A customer on his route, Margaret Lee of Harvest Christian Bookstore, tells the Chron that “I was hoping, praying that it wasn’t him,” when she heard the news. “I can’t ever remember a time where he came in grumpy. Even when he would complain a little, like if he had to really look for my packages, he’d always have a smile on his face.” Another customer recalled Louie wouldn’t use her doorbell when he knew she has a newborn baby at her house. A fundraising website for Louie's family can be found here.

Cole Valley residents were on a first name basis with driver Wayne Chan, also remembered in the Chronicle as a 28-year veteran who delivered to Amoeba Records and Booksmith book store. “I’d seen him every day for eight years. He was a really sweet guy, super-friendly, happy to be doing his job,” Booksmith store manager Camden Avery told the Chronicle. “He was just part of the community. He would chit-chat and remember our staff by name. He was just a really thoughtful guy with a kind presence.”
A singular shrine in Diamond Heights have been erected to driver “Big Mike” Lefiti, a 17-year UPS driver who delivered to the neighborhood. “‘Big’ Mike was large in size, the shrine reads, according to the Examiner. “But his laughter, concern for others, and dedication to those he loved were all much, much larger. Larger than life.”
Meanwhile. NBC Bay Area has news of the police raid of alleged assailant Jimmy Lam’s home in which investigators are trying to piece together Lam’s motives for opening fire on his colleagues and taking his own life. Authorities confiscated a computer tower — seen as critical in assessing Lam’s overtime work grievances — plus two handguns a backpack filled with ammunition and three magazines. Per the NBC Bay Area report, at least one of the handguns was not registered.

Most chillingly, one UPS driver who spoke to Hoodline indicated that Lam likely timed the assault to inflict the maximum number of casualties possible. “I definitely think he waited for the [daily] meeting to start,” driver Brandi Porter told Hoodline. That daily driver meeting begins at 8:30 a.m. and involves 55 drivers and supervisors, Lam opened fire shortly before 9 a.m.

“They say UPS drivers and police officers have the highest rate of divorce, and I say that’s because of the overtime," Porter added. “You’ll never know what goes on in the mind of a UPS truck driver.”

Related: UPS Shooting Suspect Described As 'Loner'; All Three Victims Identified