Incident Summary:

12/13/1973: Assailants shot and killed Marietta DiGirolamo, a white woman who was walking south on Divisadero Street toward Haight Street in San Francisco, California, in the United States, just after 9:00pm, The perpetrator shot DiGirolamo with a .32 caliber gun, The specific perpetrators were not identified but, it is suspected that J.C. Simon and Manuel Moore were responsible for this murder, as it occurred less than two hours after the assault on Art Agnos and it was later discovered that this was the sixth in a series of 20 racially motivated attacks (with 23 victims) targeting whie people by black Muslims who came to be known as the Zebra Killers. The perpetratorswere black Muslims who followed the Nation of Islam and believed that they had to "destroy the enemy" and "kill devils," which they interpreted as white people.



United States

North America

region/u.s. state:


San Francisco

Location Details:
On Divisadero Street, towards Haight Street

Attack Information
Type of Attack (more) Armed Assault
Successful Attack? (more) Yes
Target Information (more)
Target Type: Private Citizens & Property
Name of Entity Not applicable
Specific Description white woman, Marietta DiGirolamo
Nationality of Target United States
Additional Information
Hostages No
Ransom No
Property Damage No
Weapon Information
Type Sub-type
Firearms Handgun
Weapon Details
.32 caliber gun
Additional Information
Suicide Attack?No
Part of Multiple Incident?Yes
Criterion 1 (more) Yes
Criterion 2 (more) Yes
Criterion 3 (more) Yes
Additional Information No indictment was brought for this crime other than the conspiracy charge, due to lack of adequate evidence and witnesses; however, it is believed that J.C. Simon and Manuel Moore are responsible for the murder of Marietta DiGirolamo, as this incident occurred only about an hour and twenty minutes after the shooting of Arthur Agnos. Nonetheless, Anthony Harris, the main witness for the prosecution, never mentioned anything about the assault on DiGirolamo, and witnesses were unable to definitively identify her killer(s). The eight Zebra killers were black Muslims, who belonged to the San Francisco chapter of the independent socio-religious sect, the Nation of Islam. The perpetrators followed the teachings of Elijah Muhammad, and believed that their deity motivated them to kill the "devil," which the men interpreted to mean white people. The Nation of Islam paid for the legal representation of most members during their trials for these attacks. This was the seventh incident in a series of 20 racially motivated attacks (with 23 victims) by the perpetrators who came to be known as the Zebra killers. See also events 197310200002, 197310220003, 197310290003, 197311250004, 197312110002, 197312130002, 197312200003, 197312200004, 197312220002, 197312220003, 197312230001, 197401280001, 197401280002, 197401280003, 197401280004, 197404010003, 197404140003, and 197404160003.
Perpetrator Group Information
Group Name Claimed Responsibility
Zebra killers No
Perpetrator Statistics
Number of Perpetrators 2
Number of Captured Perpetrators Unknown
Casualty Information
Total Number of Casualties 1 Fatalities / 0 Injured
Total Number of Fatalities 1
Number of U.S. Fatalities 1
Number of Perpetrator Fatalities 0
Total Number of Injured 0
Number of U.S. Injured 0
Number of Perpetrators Injured 0
Prentice Earl Sanders and Bennett Cohen, "The Zebra Murders: A Season of Killing, Racial Madness, and Civil Rights," Arcade Publishing, Inc., 2006.
Clark Howard, "Zebra: The true account of the 179 days of terror in San Francisco," Richard Marek Publishers, 1979.