Has a player from a team that lost the StanleyCup Final ever won the Conn Smythe?

Five players have won the trophy as a member of the losing team in the Cup Final:

• Roger Crozier (1966, Detroit Red Wings)
• Glenn Hall (1968, St. Louis Blues)
• Reggie Leach (1976, Philadelphia Flyers)
• Ron Hextall (1987, Flyers)
• Jean-Sebastien Giguere (2003, Mighty Ducks of Anaheim)

Source: NHL Public Relations, nhl.com