Selected by the Pittsburgh Penguins in the sixth round (No. 102) of the 1977 NHL Draft, Millen's playing career with the Penguins, Hartford Whalers, St. Louis Blues, Quebec Nordiques, Chicago Blackhawks and Detroit Red Wings saw him compile a record of 215-284-89 with a 3.88 goals-against average, .873 save percentage and 17 shutouts.

Longtime NHL goaltender Greg Millen, who later worked as a broadcast analyst for several networks, has died, the NHL alumni association announced. He was 67.