TWIN FALLS -- 19-year-old Lane Buddenhagen now faces a first-degree murder charge for the death of his fiancee's three-year-old son in Twin Falls.

The toddler died almost three weeks ago, and the teen was originally charged with felony injury to a child. This week that charge was upped to murder when a Twin Falls grand jury handed down an indictment for murder.

According to court documents, Buddenhagen called police to his apartment August 6. Officers say they found him alone with the three-year-old laying on the bedroom floor.

Buddenhagen had told investigators the child may have fallen out of the bathtub, but when toddler went to the hospital, doctors suspected something different. They found bruises on the child's arms that looked like hand marks and severe head trauma.

The boy died the day after he was taken to the hospital, and Buddenhagen was arrested for felony injury to a child the next day.

Again, that charge was upped to first-degree murder. Buddgenhagen pleaded not guilty to that charge Friday in court.

Shortly after the three-year-old's death, KTVB spoke with the boy's mother (who is Buddenhagen's fiancee). She told us that she did not believe Buddenhagen was responsible for her son's death.

Buddenhagen's jury trial is scheduled to begin in February. Meantime, he's being held at the Twin Falls County Jail without bond.

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