Robby Gordon's Dad & Woman Found Dead In Driver's Home ... Possible Murder-Suicide

The father of NASCAR superstar Robby Gordon was found dead along with a woman believed to be his wife ... inside a Southern California home owned by his son.

Officials say 68-year-old Robert Gordon -- aka Baja Bob -- was discovered inside the home on Wednesday. The body of 57-year-old Sharon Gordon was also found inside the home.

Baja Bob was a famous off-road racer.

Cops told CBS2 in L.A. they believe they are dealing with a murder-suicide. Investigators say they found a weapon inside the home.

UPDATE -- Officers say a rifle was found inside the home.