Antioch man killed mother and half-brother, authorities say

An Antioch man has been arrested for allegedly killing his mother and half-brother and leaving their bodies in the home they shared.

Antioch police responded Wednesday around 4:10 p.m. to a residence on Fairmont Lane for a welfare check, according to a police news release.

Officers found the bodies of a woman and a man in the advanced stages of decay, police said. They found another man, later identified as 46-year-old Mark Taylor, trying to leave the home. The news release did not say how the two victims were killed.

Taylor was booked into the Contra Costa County Detention Facility in Martinez on suspicion of murder, officials said. He is the son of the dead woman and the half-brother of the dead man. The three appear to have lived in the home together.

The incident is under investigation and no further information was released.