[4] Upon arriving at the facility for work, Jimmy Lam set off the metal detector at the employee entrance, but was allowed to proceed inside the building.

[4][7][9] According to witnesses, UPS employees fled east from the building along 16th and 17th streets, and a group of approximately fifteen flagged down the passing 22-Fillmore bus to escape.

[6][7] San Francisco Police Department (SFPD) Assistant Chief Toney Chaplin confirmed the responding officers did not fire any shots.

[15][16] According to a senior coworker, Lam had taken a personal leave of absence several years ago that lasted several months, and had returned happier, but had recently "looked troubled" a few weeks prior to the shooting.

In 2010, he was arrested for driving under the influence (DUI) and hit-and-run charges after crashing into parked vehicles; he received three years of probation after pleading no contest.

[4] A week after the shooting, drivers were still "scared, frustrated [...] on edge" and only four or five co-workers in Lam's unit had returned to work, with the remainder claiming worker's compensation.

[18] A memorial service was held on July 9, 2017, at San Francisco City Hall for the slain men, attended by friends, family, coworkers, Mayor Ed Lee, and Representative Nancy Pelosi.