The year is current not 17/18 something.
The cop is the killer.
He was also a russian spy.
He was on the roof the whole time.
He was the only of his kind so they dressed up like him to make him happy and had a party.
Dude gets his head wacked off on top of a train by a sign.
The boat sinks and her lover dies.
The prisoner didnt kill the two girls but the guard executes him anyway.