` ` ' '' star 's son Mark was found dead in his Hollywood home . Officials found no indication of foul play in year - old 's death . Mark Landon had a few acting credits , playing small roles in three movies .
`` Bonanza '' star 's son Mark Landon found dead in West Hollywood home . Officials say no indication of foul play in 60-year-old 's death . Mark Landon had a few acting credits , playing small roles in three movies .