A Minnesota tree trimmer allegedly killed his coworker by crushing his head with a hydraulic grapple while the two were “f—king around” and playing shadow puppets on the job, according to authorities.

Christopher Boone Crimmins, 34, has been hit with second-degree manslaughter charges for allegedly killing his coworker, Tyler Anthony Lynch, 26, in a bloody mishap during a tree-trimming job in Apple Valley on Aug. 20, according to the Dakota County Attorney’s Office.

Crimmins was on top of a boom and operating it from his seat as Lynch, of Royalton, was picking up tree branches on the ground, according to the criminal complaint.

The pair were…

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