In addition to decades of popularity in syndication, public demand to revisit the characters led to a 1983 TV movie, Still ...

UPDATE: Tony Dow is on his deathbed ... Dow's son Christopher confirmed to PEOPLE: "This is a difficult time. Yes he is still alive but in his last hours. Under hospice care." ...

Tony Dow's family has confirmed the actor has died ... Hours later, Christopher told PEOPLE the star was still alive but that the family was going through "a difficult time." ...