A Tennessee man, Timothy Wilks, was shot and killed Friday night after a robbery prank for YouTube ended tragically, NBC News reports

Wilks, 20, and a friend approached a group of people, including 23-year-old David Starnes Jr., in the parking lot of Urban Air Trampoline and Adventure Park at about 9:20 p.m. with butcher knives in their hands. 

Starnes Jr. told Nashville authorities when they arrived that he didn’t know that the two were filming a prank, and shot because he thought he and others were in danger. 

Starnes Jr. has not been arrested or charged for the shooting. Police are investigating whether he was acting in self-defense. 

Buzzfeed News notes YouTubers Alan and Alex Stokes were charged last year with false imprisonment and swatting after pretending to rob a bank and carjack an Uber driver. When police arrived, the driver was held at gunpoint and later released under the assumption that he was involved with the Stokes twins.