Detectives allege the men shot the victim, 60-year-old Kelly McClurg, during an attempt to rob him of marijuana, according to the Sheriff's Department.
The suspects were acquaintances of the victim, officials said.
On Wednesday, deputies arrested Daniel Valine, 44, pictured at top left, and Justin Valine, 23, pictured at bottom left, on suspicion of murder and robbery, officials said. They were booked into the Sacramento County Main Jail.
Kailan James, 22, was arrested on suspicion of the same charges in Phoenix and will be extradited to Sacramento County.