Ellery Queen1975

Ellery Queen:
I may be wrong, but I think I know how Norris Wentworth was killed-and why, and who did it. Remember, the autopsy definitely established it was a heart attack-but was someone responsible for that heart attack? I think so, and it all has to do with the broken window in Wentworth's car outside the museum, and the key ring in his pocket. Let's see if we come up with the same answer.