Marin County man accused of killing older brother

A man was arrested after he shot and killed his brother early Wednesday near Mill Valley, authorities said.

The suspect, Johnson Gibbs, 41, shot his 43-year-old brother in the chest at their home on Bayview Terrace in the Strawberry neighborhood about 12:30 a.m., said Marin County sheriff’s Lt. Jamie Scardina.

The name of the victim was not immediately released. A gun was recovered, Scardina said.

The brothers live at the home with their mother and uncle, authorities said. Investigators were interviewing relatives in an effort to determine a motive in the case.

Henry K. Lee is a San Francisco Chronicle staff writer. E-mail: hlee@sfchronicle.com Twitter: @henryklee