Dead in 3 Days

Dead inDays InTagen bist du tot is a 2006 Austrian horror film written and directed by Andreas Prochaska, and cowritten by Thomas Baum. It was followed by a 2008 sequel titled Dead inDays 2.

Martins killer captures Nina and attempts to drown her, but she is saved by Patrick, who the murderer stabs to death while Nina escapes. As Nina recovers in a hospital, the killer decapitates Alex by slamming her onto the frayed edge of a fish tank. Nina identifies her attacker as Manfred Haas, the father of Fabian Haas, a childhood friend who died due to falling through a frozen lake that he was playing ice hockey on with her, Martin, Mona, Clemens, and Alex.The police inform Nina that Manfred hanged himself two years after his sons death, and that his wife moved away, though she still owns a house nearby. Nina, Mona, and Clemens sneak out to explore the Haas property, and are followed by Ninas sister, Kerstin. The killer binds and gags Kerstin, and is revealed to be Mrs. Haas, who is attempting to avenge her sons death which occurred three days after he fell through the ice while wearing a mask fashioned out of her dead husbands preserved face. ........

Source: Wikipedia