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A Layton man admitted Thursday that he caused the death of his girlfriend's baby.

Tyler Ryan Geary, 26, pleaded guilty to second-degree felony counts of child abuse homicide and child abuse in the shaking death of 11-month-old Aliyah Wild two years ago.

Geary faces up to 15 years in prison for each charge when he is sentenced on May 7 by 2nd District Judge Thomas Kay.

He was originally charged with first-degree felony child abuse homicide in the girl's Sept. 10, 2013 death.

During an April 2014 preliminary hearing, Layton City police Detective Eric Smith said that police became involved with the case after the child was brought to a local hospital with a brain injury, and was then taken by medical helicopter to Primary Children's Medical Center.

Medical officials had alerted local law enforcement because the circumstances surrounding Aliyah's injuries were "suspicious," according to Smith.

As part of their investigation, Smith said detectives interviewed Geary, who had been watching the child before her injury occurred.

Geary changed his story several times during the police interview, Smith testified, but ultimately the man confessed that he became frustrated and shook Aliyah for about 30 or 40 seconds and then dropped her on a bed. It was then that the child lost consciousness, according to a police interview played in court.

After the injury, Geary called his girlfriend and took the child to a local hospital, where she was diagnosed with severe intracranial bleeding that caused swelling on her brain, according to court documents. Doctors performed emergency surgery to remove part of her skull to reduce pressure on her brain, but her condition deteriorated.

She was taken off life support and died Sept. 17, 2013.

An autopsy revealed brain injuries consistent with the trauma of being shaken and dropped as Geary described, according to police.