Richard Harrison, best known to viewers of the History Channel reality series "Pawn Stars" as "The Old Man," died Monday morning after a long battle with Parkinson's Disease, according to his son, Rick Harrison. Richard "The Old Man" Harrison (L) and his son Rick Harrison in 2014.

Richard Harrison, best known to viewers of the History Channel reality series "Pawn Stars" as "The Old Man," died Monday morning after a long battle with Parkinson's Disease, according to his son, Rick Harrison. Richard "The Old Man" Harrison (L) and his son Rick Harrison in 2014.

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'Pawn Stars' star Richard Harrison, known as 'The Old Man,' dies

Richard Harrison, best known to viewers of the History Channel reality series "Pawn Stars" as "The Old Man," died Monday morning after a long battle with Parkinson's Disease, according to his son, Rick Harrison.