Cesar Lozano, 23, of Reseda, was taken into custody Tuesday evening and booked, according to the Los Angeles Police Department.
He is suspected in the killing of Guillermo Hernandez, one of two people who were shot after an argument escalated at the party. Hernandez died at the scene and a 69-year-old man was hospitalized in critical condition with four gunshot wounds.
The murder case will be presented to the District Attorney's Office on Thursday, an LAPD spokesperson said.