Zachary and Brandon Sims, 23 and 26 respectively, worked for Bad Dog Bail Bonds. They were shot to death at a Bakersfield home Thursday night while trying to confront a customer wanted on a drug paraphernalia charge.
Police said 26-year-old Stephen Michael Stewart is considered a suspect in the slayings and remains at large.
Famous bounty hunter Duane "Dog" Chapman is offering a $10,000 reward for information leading to Stewart's arrest.
The Associated Press contributed to this report.