Michael Landon's Son Dead

Mark Landon, 60, the eldest adopted son of television actor Michael Landon, only lived to be six years older than his famous father, who died at 54 in 1991. In a tragic announcement today, Los Angeles investigators said Mark, who also was an actor, was found dead Monday at his home in West Hollywood.

According to a report from the Los Angeles County Sheriff's Department, foul play is not suspected. However, no cause of death has been announced.

Unlike his father, the younger Landon did not reach the iconic fame of his father's storied career, which included starring as Joseph "Little Joe" Cartwright in 14 seasons of television's longest running series, "Bonanza." He also played family matriarch Charles Ingalls in the widely-popular 1970's series, "Little House on the Praire."

Mark Landon, according to Internet Movie Database, only appeared in three films between 1986 and 1997, including starring as a cab driver in "Us," a film directed by his father

Michael Landon married Mark's mother, Dodie Frasier, in 1956 and also adopted his younger brother Josh. He later had four children with his second wife, Lynn Noe, and two children with his third wife, Cindy Landon.