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DENVER – The Denver District Attorney's Office said a defendant in multiple sex assaults, William Costello, killed himself Thursday morning.

Costello's trial in a series of sex assaults dating back to 2008 started this week in Denver District Court.

The court declared a mistrial Thursday morning after learning that Costello took his own life.

According to police, he did not show up for his 8:30 a.m. trial. The court waited, but after a while decided to monitor him using GPS.

The GPS had him at various locations, but he was later found in the area of Brighton Boulevard by paramedics.

"It's sad resolution, but it is a resolution. There are a lot of people that have waited a lot of years for Mr. Costello to be held accountable for what he did," Denver District Attorney Mitch Morrissey said.

"He wasn't a good guy, he lived a double life. He's out raping women in our community, while he's putting on this front [as a] good dad ...Realtor, those types of things. That's why DNA is so important, because it uncovers people like this," Morrissey said.

9NEWS reached Elizabeth, a 19-year-old who was 13 when court documents say Costello raped her felt like justice won't be done.

"I think it's sad," she said. "I think he did it because he didn't want to face the consequences of what would happen to him."

Police did not release his cause of death yet.

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