https://mattkprovideo.com/2018/01/20/chuck-cunningham-from-happy-days/

Garry Marshall on the missing Chuck Cunningham from Happy Days

 

THE DISAPPEARANCE OF RICHIE’S OLDER BROTHER CHUCK A T V MYSTERY HAPPY DAYS

 

Tom Bosley on the disappearance of Chuck Cunningham on “Happy Days”

 

 

http://tvtropes.org/pmwiki/pmwiki.php/Main/ChuckCunninghamSyndrome