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SUBMIT YOUR IDEAhere's my take on 440
My last comment didn't tick this off, for some reason.
Here is my solution
I guess I tend to overthink things, but
(1) shouldn't the name of the suspect also be present in all the events in which a murder had occurred?
and (2) what says that if a murder wasn't committed the suspect wasn't present?
In other words, if this is also a 'logic' puzzle, it should have been mentioned that the killer ALWAYS kills whenever he/she is present during it's operating hours; ie. if there was not murder, the killer was not present.
Still a nice break from pure analytics and a creative challenge.