Jingle All the Slay (1970)

Hank Carter, a highly skilled hitman, has one last chance to save his marriage. Determined to give his family the perfect Christmas at a luxurious lake mansion, Hank tries to hide his dangerous profession. But when a bounty is placed on his head, waves of holiday-themed hitmen descend on the mansion, and Hank must fend them off using every Christmas decoration in sight—all while keeping his family in the dark.