The Toughman competition has been put on hold following Tuesday's death of Stacy Young that prompted a criminal investigation by police in Sarasota, Fla.

The Detroit News reported that Toughman founder Art Dore will conduct his own investigation while temporarily ceasing operations. The newspaper reported that Young is the 13th fatality since the competition's inception in 1979, and is the fourth death in the past 10 months.

"I'm very concerned, as well as everybody else," Dore told the newspaper. "We've been doing this 24 years, and now, all of a sudden, all these injuries. I need to find out what the hell is wrong. We're not doing anything different." Dore said that 86 events had been scheduled during the next year. The News reported that if all those events are canceled, Dore would lose more than $1 million.

Young suffered swelling and bleeding in the brain following her fight Saturday. A mother of two, Young entered the competition on the spur of the moment after learning that the only woman wanting to fight needed an opponent.

Young was disconnected from life support Tuesday afternoon after being declared brain dead Monday night at Bayfront Medical Center in St. Petersburg, hospital spokesman Bill Hervey said.

"It's supposed to be fun," said Chuck Young, who also fought Saturday, but just 29 seconds in his bout. "They tell us nobody's going to get hurt. The worst that could happen was to get a broken nose."

There were no cash prizes for the bouts in the publicly owned Robarts Arena, at the Sarasota County fairgrounds. In Florida, prize money for boxing is legal only in tightly regulated professional bouts.

At 240 pounds, Young outweighed her opponent by about 60 pounds. But in the first 30 seconds of the bout, family members knew it was an uneven match, said her sister Jodie Meyers.

Young nearly lasted all three rounds before falling the final time, Meyers said, adding that doctors told her any one of the many blows could have damaged Young's brain.

The News reported that two other competitors, both males, were also injured Saturday, with one taken to intensive care.

Dore told the newspaper that no ringside physicians -- just a physician's assistant -- were present at the event.

Dore said he thought a physician had been hired for the Sarasota event, but "I don't know what happened, my staff messed up somehow," he told the paper.

Information from The Associated Press was used in this report.