One Minute Mystery

The cold opening: a moment of darkness and then there was a dead body in a subway train, only five passengers were standing in the compartment. Each has a different perspective on the crime scene, what happened before and who might be the killer.

The catch?

They only have one minute before the train they are on crashes.

Can you help one of them solve the mystery and grasp a momentary victory from their inevitable doom?  Does it even matter whether you solve the mystery or not?