"It paid off," is how Austin Police Chief Paul M. Philipp described the use of DNA testing in solving a high profile sexual assault case.

The use of DNA testing is "relatively rare" in solving cases investigated by the Austin Police Department.

However, the results were indisputable in this case. Reading from the laborator report, Philipp noted the sample taken matched only one person in the world.

Philipp said that person is Aaron Michael Hayes, 21 of Austin.

Hayes was arrested and charged Monday morning after voluntarily coming to the Austin-Mower County Law Enforcement Center.

That set in motion a series of bizarre events.

According to Austin police reports, Hayes arrived at the LEC around 10 a.m. Monday and was taken to an interview room. There, senior detective Tom Stiehm and the department's second-in-command, Capt. Curt Rude, started to interview Hayes

"When Mr. Hayes was notified he was under arrest and to be charged with the sexual assault, he was placed up against the wall to be searched," the report noted.

At that point, Hayes apparently panicked and reached into his pocket and pulled out a folding knife with a 4-inch blade. The report stated, "Capt. Rude yelled 'He's got a knife!' and a struggle ensued."

Stiehm and Rude wrestled Hayes to the floor and called for assistance from other officers.

Rude suffered a small cut on a wrist in the struggle. Stiehm was uninjured, but another officer -- unidentified -- suffered a minor ankle injury in the scuffle.

That was 10:20 a.m. Monday.

At 12:38 p.m. that same day, Hayes was in a holding cell on the third floor of the LEC.