Murder-Rock: Dancing Death 4K 1984

An unknown killer murders girls from a dance school in an unusual way: first, he puts his victims to sleep with ether, then pierces their hearts with a long needle. The mentor of the victims sees a man in her dreams, a retired actor who is drinking himself to death, who is trying to kill her. She finds this man and they begin a romance. The dancers continue to die from stabs to the heart...