Sandra Dier is a character in Friday the 13th Part II, played by Marta Kober.
Later on, as Jeff plays video games with Mark Jarvis, she tempts him into having sex. After having sex with Jeff, Sandra notices Jason Voorhees enter the room, wielding Ted's spear. Before she can warn Jeff, who is on top of her, Sandra is killed when Jason drives the spear through Jeff, her body, the bed and into the floor. After killing her, Jason hides Sandra's corpse in the bed he murdered her and Jeff in.