The documents say Bennette gave two close friends a gun and told them to get rid of it after Vaughn disappeared March 19.
About a week later, court documents say, Bennette's father said to detectives that his son told him the gun "went off and Yashanee was hit." The prosecution papers also say that detectives found large blood stains soaked through Bennette's bedroom carpet, and that they found bloody clothing and blood spatters on the wall. The DNA from that blood matched Vaughn.
Bennette has since denied all of this to detectives and the girl's body still hasn't been found.
FOX 12 spoke with Vaughn's family Thursday night after the details of the alleged admission surfaced.
"I hope that by seeing me, seeing her family, seeing us grieve, knowing that we're going through a lot of pain, it's been a long three months, just let him know and let him see," said Shaquita Louis, the victim's mother. "Maybe it will hit him and he'll just open up his mouth and give us the closure."
The court documents say Bennette admitted meeting up with Vaughn at a Taco Bell restaurant on the evening of March 19, but he says they parted ways afterwards.
But police say they have cell phone records that show Vaughn's phone was pinging off cellular towers in the area of Bennette's home in northeast Portland after they met up at Taco Bell.
Nine days after Vaughn disappeared, police served search warrants at Bennette's home and they say they found the blood in the bedroom.
A shell casing from a .38 caliber revolver was also discovered at Bennette's home and seized by police.
On April 8, Bennette was indicted on charges of murder and manslaughter. He pleaded not guilty to the charges, both of which are Measure 11 crimes.
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