Cesar Arana was 21 and a resident of Antioch when he was killed in a shooting at a 24 Hour Fitness gym in Brentwood, California, on August 11, 2022. The shooting occurred about 1:55 a.m. after a fight began on or near the gym’s basketball court and continued into the parking lot. Surveillance footage showed at least two people opened fire. Arana was pronounced dead at the scene; three other people were wounded and taken to local hospitals.

Brentwood police detained two people initially. One detainee, a 17-year-old Brentwood resident, was arrested and booked into the Contra Costa Juvenile Detention Center on suspicion of murder; that juvenile’s identity has been withheld. The second person who had been detained was later released after investigators determined he was not one of the shooters. Detective Greene is assigned and police are asking anyone with information to come forward.

If anyone has tips or remembers activity around the gym that night, please share what you know with investigators.