William Thomas Sadler (born April 13, 1950) is an American film and television actor. His television and motion picture roles have included Lewis Burwell "Chesty" Puller in The Pacific, Luther Sloan in Star Trek: Deep Space Nine, Sheriff Jim Valenti in Roswell, convict Heywood in The Shawshank Redemption, and the Grim Reaper in Bill & Ted's Bogus Journey, a role for which he won the Saturn Award for Best Supporting Actor, and his role as the villainous Colonel Stuart opposite Bruce Willis in Die Hard 2. He played the character of President of the United States, Matthew Ellis, in Iron Man 3 and in Marvel's Agents of S.H.I.E.L.D., and recurs as Steve McGarrett's murdered father in the latter-day 2000's remake of Hawaii Five-O. In 2015, Sadler had an appearance in the TV series Z Nation.