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Mark Patrick Costello

Mark Patrick Costello was born on March 9, 1966 in Utica, New York, USA. He is an actor, known for Holmes and Yoyo (1976). He has been married to Gwenn Garland since May 23, 1998. See full bio »

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What Lies Beneath
Sat, Aug 24 10:00 AM PDT on FLIX (602)
What Lies Beneath
Wed, Aug 28 4:05 PM PDT on SHOWB (582)

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Known For

Holmes and Yoyo Kid on Bike


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 2000 What Lies Beneath (uncredited)
 1976 Holmes and Yoyo (TV Series)
Kid on Bike
- Pilot (1976) ... Kid on Bike

Personal Details


6' 5" (1.96 m)

Did You Know?


Briefly played in the NBA for the Washington Bullets (10-day contract in 1991). Played professional basketball in Italy for five seasons.

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