He died in a fist fight.
So... outnumbered 15:1, a pudgy, middle-aged reporter decided to engage in a fist fight?
Yep.
Well. Forensic science will surely corroborate your story. Where's the body?
Uhhhhh..... Wait. Scratch that. Look... he left via the back door wearing one of the 15 guys shoes and went sight-seeing.
I'm half expecting to find out the 15 men have an airtight alibi and it's all an elaborate ruse to throw the world off the scent of the actual killers.