Be a detective and solve this case: There are 53 bicycles in a room, and a man is dead on the floor next to them. Why was the man killed?

"Bicycle" is a deck of playing cards.

Since a deck contains 52 cards (commonly known), and there were 53 cards found near the man's body, this means that this man was cheating.

Based on this, a scenario that suits his death would be that he was caught cheating and killed for doing so.