The Merced County Sheriff's Office says the shooting happened at 7:30 p.m. Saturday on Bobbi Avenue near Winton Way in Winton.
When deputies arrived, they found a man, now identified as 24-year-old Angel Ramirez of Winton, lying on the ground with a gunshot wound to the head.
The victim was airlifted to the hospital where he was pronounced dead.
PREVIOUS COVERAGE: Man shot and killed in Merced County, 2 persons of interest under investigation
Investigators arrested a 17-year-old child from Winton for murder and 20-year-old Jerardo Ochoa-Aguilar of Winton for accessory to murder.
Deputies say the shooting happened at a home during a party that both the victim and suspect were attending.
A motive for the shooting is not yet known.