Mathew St. Patrick (born March 17, 1969) is an American actor best known for his roles as Keith Charles on the HBO drama series Six Feet Under (2001-05), Detective Kenneth Marjorino on the short-lived series Reunion (2005-06), Adrian Sword in All My Children (1998-2000). Marcus Tagger in The Young and the Restless (1997). He was the first voice of Skulker on Danny Phantom.