(Riverton, Wyo.) – The 16-year-old who allegedly robbed a woman in the Walmart parking lot using a pellet gun on Nov. 10 is being charged as an adult and could face up to 25 years in prison if convicted.

Adrian Joseph Sixfeathers of St. Stephen’s has been charged with Aggravated Robbery, a felony punishable by five to 25 years in prison. He has been over to Wyoming’s Ninth District Court in Lander for further proceedings. He has not yet entered a plea. Sixfeathers is being held on a $100,000 cash bond.

He has two adult co-defendants, Curtis Oldman, 27, and Tiesha Underwood, 22, both of Lander. Oldman has been charged with Conspiracy to Commit a Felony and Accessory before the Fact. Underwood is charged with Conspiracy to Commit Aggravated Robbery and Aiding and Abetting Aggravated Robbery. They both are being held on $50,000 cash bonds. Underwood has been bound over to district court as well, and Oldman will have his preliminary hearing in Riverton Circuit Court next Wednesday.

“On or about November 10, 2013, an emergency call from the Wal-Mart store in Riverton alerted that a male suspect had just recently pointed a gun at a female’s head in the Wal-Mart parking lot,” states the affidavit in cases. “The caller also reported that the male suspect had stolen the female victim’s purse.”

According to court documents, the victim told police that after purchasing item in the store and walking to her vehicle when a male subject approached.

“She stated that the suspect pulled a black handgun out and pulled the slide back,” states the affidavit. “The suspect then pointed the gun to her head and said ‘I’m going to shoot you if you don’t give me your purse.’ She then gave the suspect her purse.”

The court documents state the woman was able to give a description of the get-away vehicle used, and RPD Officer Amy Luton observed it traveling southbound on Federal Boulevard shortly after the 911 call. The vehicle failed to stop for the officer, and a pursuit continued onto the Wind River Indian Reservation until the suspect vehicle stopped on the 1400 block of 17 Mile Road.

Two men, later identified as Oldman and Sixfeathers allegedly fled the vehicle. Sixfeathers was observed throwing a pellet gun, which resembled a semi-automatic handgun. Both men were detained, and the victim identified the gun thrown as the one used in the robbery.

Underwood reportedly remained in the driver’s seat after the vehicle stopped.

“Underwood admitted during question that she, Adrian Joseph Sixfeathers and Curtis Oldman were involved in the robbery at Wal-Mart,” states the affidavit. “She advised that prior to the robbery she, Sixfeathers, and Oldman were attempting to sell I-pods at the ‘Game Stop’ in Riverton. At that time, Sixfeathers, suggested that they go to Wal-Mart and he would ‘grab a bag’ from someone. Underwood knew that the purpose was to get gas money. She stated that the three went to Wal-Mart and then she parked the car. Sixfeathers got out of the vehicle and ran back a short time later with a purse and told her to ‘go, go, go.’”

The affidavit also states that the victim’s purse was found in the vehicle driven by Underwood, and that the victim positively identified Sixfeathers as the one who robbed her.