A man turns out the light and goes to bed. He is not in his own home. The room he is in is not in a building ten stories tall or higher. He is alone in the room.
Then, he hears a loud CRASH!!!! from outside the window. He looks out.
He sees that it is dark outside, and that there is or are one or more people outside. He does not see any cars. He does not see anyone he knows.
Horrified by what he sees, he intentionally leaps out the window to his death - a suicide. He is killed by the fall.
During this series of events, the man saw a crime committed.
You may ask yes or no questions.