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A tentative November trial date has been set for a teen charged as an adult with killing his 15-year-old girlfriend, Anne Kasprzak, and throwing her body into the Jordan River.

Darwin Christopher Bagshaw, who turned 18 in June, is charged in 3rd District Court with first-degree felony murder for the beating death of Kasprzak three years ago.

He has pleaded not guilty to the charge.

On Friday, Judge James Blanch scheduled a 12-day trial to begin Nov. 30.

The date could change once Bagshaw's attorney reviews a new piece of evidence — an interview — which he learned about just recently in a discovery motion filed by prosecutors.

"That could impact the way we are going forward with the trial and the experts we will hire," Chris Bown told Blanch.

The judge set a hearing for Aug. 28 to decide whether the trial should be moved to 2016 based on Bown's assessment of the new interview.

Court papers filed by Salt Lake County prosecutors in the past week, include two interviews among the various evidence items. The most recent interview is from July 15, although the document includes no information about its content.

Bagshaw was 14 at the time of the September 2012 slaying and was originally charged in juvenile court with counts of first-degree felony murder and second-degree felony obstructing justice.

Juvenile Court Judge Dane Nolan certified the teen to stand trial in adult court in April, dismissing the obstruction charge in the process.

Bagshaw, who had been held in a juvenile detention facility since his arrest last year, was transferred to the Salt Lake County Jail last month, after his 18th birthday. Bail is set at $1 million.

Bown said the teen is adjusting to the new environment "as well as can be expected for an 18-year-old who was in a juvenile detention facility prior to this."

Kasprzak was reported missing from her Riverton home March 10, 2012. Her beaten body was pulled from the Jordan River in Draper the next day.

Prosecutors contend the murder was premeditated, saying Bagshaw lured Kasprzak to the river, killed her and dumped her body, and then tried to cover up the crime.

Kasprzak had been telling friends and family she was pregnant with Bagshaw's baby. However, during a hearing in juvenile court, her stepfather testified that she wasn't pregnant.

An autopsy concluded Kasprzak had suffered up to nine blows, which left her skull fractured and her forehead shattered.

Bagshaw was charged in October 2014 and arrested at a residence in Colorado where he was living with family.

jdobner@sltrib.com