The Amsterdam Maniac

The Amsterdam Maniac (or more simply The Maniac) is the main antagonist of the 1988 Dutch horror film Amsterdamned. He was a former diver who was disfigured and driven insane after a diving accident.

He was mainly portrayed by Door van Boekel, but for the boat chase, he was portrayed by Nick Gillard.

Biography
As children, Martin Ruysdael and the man who would become the maniac were good friends. They spent time diving together, while Martin became a psychiatrist, the maniac became a worker for a chemical plant. During one of his diving jobs, his boss lied to him, telling him that the chemicals he was moving were harmless. Unfortunately that was untrue, as the chemicals were uranium hexafluoride. One of the containers opened underwater and he was exposed to the chemicals, which disfigured his face and messed with his mind. The man was considered unfit for his job and was fired. Combined with being shunned for his hideous face, the man lost his sanity and used his skills to swim in the Amsterdam canals undetected, and would soon begin a killing spree.

Victims

 * 1: Prostitute | Stabbed 16 times with a carving knife.
 * 2: Environmentalist #2 | Decapitated.
 * 3: Environmentalist #1 | Dragged into the water and stabbed.
 * 4: Salvationist | Pulled into the water and stabbed multiple times.
 * 5: Girl in Rubber Boat | Slashed with knife.
 * 6: Skipper | Drowned in boat.
 * 7: John van Meegeran | Stabbed multiple times, drowned.

Trivia

 * He is only credited as Maniac or Maniak.