Mark's biological mother was Michael's then wife, Dodie Levy-Fraser.
Mark also had a small role as a Navy SEAL in the 1997 movie Goodbye America.
Mark Landon was found dead at his West Hollywood home in the 1300 block of North Sweetzer Avenue around noon on May 11, 2009, at age 52.
He was interred at the Hillside Memorial Park Cemetery in Culver City, California, in the same crypt as his father.
West Hollywood sheriff's investigators stated that there was no suspicion of foul play.