The Sheriff's Department is offering a $1,000 reward for information leading to the whereabouts of Hector Hernandez, 25, of Moorpark.
Officials suspect Hernandez may have shot two Moorpark men Sunday.
Deputies found Liborio Lopez, 31, and Silvano Lopez, 23, sprawled out in the street in the 400 block of Block Avenue early Sunday.
They were taken to Simi Valley Hospital, where they underwent surgery for multiple gunshot wounds. Hospital officials said Monday that Liborio Lopez was listed in serious condition and Silvano Lopez was listed in fair condition.
There were no witnesses to the shooting, but people interviewed said they heard an argument just before hearing the sound of shots fired, officials said.