Factual error: Whenever the killer (always dressed in black with a balaclava disguising his/her identity) uses a knife, the blow invariably is an overhand strike. However, a knife in a downward thrust quite frequently simply skids off the overlapping ribcage of the victim.
Factual error: A bike rider is warming down on freestanding rollers and is apparently thrown off when an assailant sticks a wrench in the front wheel. That is not how physics work. If a bike is in motion, the forward momentum of the bike and rider will absolutely throw the rider head over heels. But on freestanding rollers, there is no momentum. The bike and rider are standing still and only the wheels are moving. The rider will, of course, topple off but not be thrown.
Answer: Yes, he appeared in an episode called "Judgement Day", shown in 2000.
Tailkinker ★