Mark Landon dead !!

Mark Landon, Michael Landon’s oldest son, is dead at age 60. Mark Landon’s death shows no foul play, says LAPD Monday night.

The son of "Bonanza" and "Little House on the Prarie" actor Michael Landon was found dead inside his West Hollywood home this afternoon, authorities said.

Mark Landon, 60, was found about noon in the 1300 block of Sweetzer Avenue.

The Los Angeles County Sheriff's Department is investigating the incident, but a spokeswoman said there was no evidence of foul play.

His mother was Dodie Fraiser; Michael Landon and Frasier married in 1956. Landon thereafter adopted Mark and his brother. Michael Landon died in 1991 of cancer.

Mark’s cause of death is yet unknown. Funeral arrangements have not been announced. And no statement from the Landon family has been issued.