The deadly shooting unfolded July 24 at an apartment on Wilcox Avenue, according to the Los Angeles Police Department. That's where the suspect, identified as 57-year-old Patrick Kevin Spurlock, and victims were gathered when police say some sort of altercation occurred.
Spurlock ordered the victims by gunpoint to get on the floor before shooting them multiple times.
The victims, identified as 50-year-old Jeremiah Badecker, 33-year-old Michael Bogacz and Jack Cartenga, were found inside the apartment several days later and pronounced dead.
Spurlock was arrested on Friday and booked for murder on no bail.
Police have not released information on a motive for the shooting, or what the altercation between the suspect and victims was about.