"Mark Walsh, FOX Freelancer," Is Just A Role Performed By Mark Humphrey, Actor

The comparison image is taken from the third installment of the Mark Humphrey demo reel.

Curiously, the character played by Mark Humphrey @ 0:34 in the CSI: Miami episode ["Gone Baby Gone"] is named "Stuart Walsh."

It may be noteworthy that the producer of that episode, Marco Black, is the son of director Noel Black, who "first gained widespread recognition for a highly regarded movie in the film noir genre, Pretty Poison (1968), which starred Anthony Perkins," whose wife, Berry Berenson, is alleged to have died aboard American Airlines Flight 11.