[SgtHooper]

Just another version of the knock-out game.

[Veto!]

Or maybe this was a lovers' quarrel. Here's pix of Calvin 'Kirk' Esdaile, the perp from Daily Mail:

The victim doesn't look that strange. See all at the Daily Mail, which is always 'way ahead of the rest of the press in these types of cases.

http://www.dailymail.co.uk/news/article-2925867/Shooting-Home-Depot-store-New-York-City-leaves-one-dead.html