This did happen, in New Jersey, many years ago. The channel that is milled down the side of valves now (patent held by Gino at National Paintball Supply I believe) is a design change made as a result of that incident. It was a 10mil payout for the mom, who died, and 5 more for her son, who saw it. Biggest insurance payout in Pball history.Did hear stories of a fatality at an unamed site on a 14th birthday party. Although it wasn't a playing accident more of an equipment malfunction. The fatality was supposedly the 14 year old boys mother who had arranged the party. During spectating a bottle had supposedly blown off one of the rental guns or from the reg and struck the mother in the side of the head. Apparently died as the paramedics tended to her.
I have tried looking up any info but this seems to be merely Chinese whispers at this point as there isn't as much as a newspaper article on the incident.