When Did Mart McChesney Die?

Mart Dayne McChesney was an American film and television actor. He was best known for his appearances in Star Trek: The Next Generation as the tar creature Armus in the first season episode "Skin of Evil", and as Sheliak in the third season episode "The Ensigns of Command". For his Star Trek: The Next Generation appearances, he wore heavy prosthetics and costumes. Footage of his appearance as Armus was re-used in the series second season episode "Shades of Gray".