On the afternoon of July 1, 1993, at approximately 2:57 p.m., a 55-year-old man named Gian Luigi Ferri entered the office building at 101 California Street in San Francisco and went to the offices of the law firm Pettit & Martin, which occupied several upper floors of the building. Ferri had a past, limited connection to the firm: in 1981 Pettit & Martin had referred him to other legal counsel regarding real estate matters in the Midwest and had no further contact with him in the twelve years that followed. Ferri had reportedly expressed hostility toward lawyers in general weeks before the attack.
After exiting an elevator on the 34th floor — a stop caused incidentally by another employee's call button — Ferri put on ear protection and began shooting with two TEC-9 pistols fitted with Hell-Fire trigger systems and a .45-caliber semiautomatic handgun, using a mix of Black Talon hollow-point and standard ammunition. He moved through the 34th floor, then descended an internal staircase to continue shooting on lower floors. As San Francisco police closed in, Ferri died by suicide. In total, eight people were killed and six others were injured.
Those killed included Shirley Mooser and Donald "Mike" Merrill, both employees of the Trust Company of the West; Allen J. Berk and John Scully, attorneys at Pettit & Martin (Scully was reported to have shielded his wife, Michelle Scully, who was injured in the attack); Deborah Fogel, a legal secretary with Davis Wright Tremaine; David Sutcliffe, a law student interning at Pettit & Martin; and attorney Jack Berman and his client Jody Jones Sposato, who were together for a deposition at the time of the shooting. Those injured included Victoria Smith, Sharon Jones O'Roke (the first person shot), Michelle Scully, Brian F. Berger (who died in 1995, with his death later attributed to wounds from the shooting), court reporter Deanna Eaves, and Charles Ross.
A four-page typed letter left by Ferri contained numerous grammatical errors and complaints, including claims that he had been poisoned by MSG and "raped" by Pettit & Martin and other firms, along with a list of more than 30 people described as "criminals, rapists, racketeeres [sic], lobbyists" — none of whom were among the victims. Investigators and reporters were unable to determine a clear, coherent motive from the letter.
The shootings prompted calls for stricter gun control and contributed to subsequent legislative efforts, including provisions that preceded the federal Violent Crime Control and Law Enforcement Act of 1994. California adopted additional firearms regulations in the aftermath, and organizations such as Legal Community Against Violence and the Jack Berman Advocacy Center were founded in response to the attack. Pettit & Martin, already experiencing financial difficulties before the shooting, dissolved in 1995 following partner departures.