The shooting was reported shortly before 12:30 a.m. at a home in the 17000 block of East Bellbrook Street, according to the Los Angeles County Sheriff's Department.
Deputies arrived to find two men suffering from gunshot wounds, according to a news release. One victim was pronounced dead at the scene; three others were transported to a hospital.
L.A. County sheriff's Sgt. Guillermo Morales said there was a physical altercation between two groups at some point during the party. That led to the shooting.
2 killed, 2 wounded when shooter opens fire at Halloween party in Covina; suspect at large
"The argument spilled out to the driveway where at least one gunman used a gun to fire at the victims," Morales said.
Investigators say about 70 people gathered for the celebration. It's unknown if the suspect was invited to the party.
One of the victims killed was identified by the coroner's office as 20-year-old Ronnie Benitez. His 33-year-old uncle, whose name has not been released, died at the hospital.
The conditions of the two men who survived were unknown.
A Sheriff's Department statement said the suspect fled the scene.
A description of the suspect was not available.
Anyone with information about the shooting is urged to call the sheriff's Homicide Bureau at (323) 890-5500.
A GoFundMe page was set up for Ronnie Benitez's family. If you want to donate, click here.
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