The co-main event at Legacy Fighting Alliance 78 on Friday night between Jose Johnson and Rafael Costa ended with a devastating knockout.

Johnson was defending against a Costa takedown attempt when he delivered a brutal elbow to the head for a knockout victory.

Costa dropped to the canvas after taking the elbow to the side of his head.  He landed facedown and twitched briefly before laying motionless.

Flip the Page to see the brutal knockout:

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