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A Grantsville man and his mother have both been charged in connection with the 2012 death of the man's 18-month-old daughter — who died from drug toxicity.

Brandon Lee Kimber, 34, was charged Monday in Tooele's 3rd District Court with second-degree felony child abuse homicide for the Dec. 5, 2012 death of the child, identified in court documents as E.K.

Kimber and his mother, Tracie Cullister Holbert, 53, were both charged last November in Grantsville City's justice court with one count each of negligent homicide and reckless endangerment, both class A misdemeanors.

Holbert's case will remain in justice court, while the misdemeanor charges against Kimber will be dismissed in favor of the felony charge, said Utah Assistant Attorney General Matthew Lloyd, whose office is prosecuting Kimber.

No court dates have been set for Kimber.

Holbert was due in court on Tuesday for a pre-trial conference, but the court docket had not been updated by the end of the day Tuesday.

According to a probable cause statement filed with Kimber's charges, Grantsville police were called Dec. 6, 2012, to an unattended death and told the child had been found unresponsive in her crib by Holbert, her grandmother.

A month later, the state medical examiner's officer informed police that the cause of the child's death was drug toxicity. The medical examiner found there were amounts of hydrocodone and alprazolam in E.K.'s system that would be fatal to an adult male, according to charges.

Kimber and Holbert were the only other people in the home in the time leading up to the child's death, charges state.

Both Kimber and Holbert lived in the home with the child and kept their prescriptions in the home, charges state.

At the time of the child's death, Holbert had active prescriptions for both hydrocodone, a pain medication, and alprazolam, an anti-anxiety drug. Kimber also had an active prescription for alprazolam .

Kimber told police that between 10 and 11 p.m. Dec. 5, 2012, E.K. "was snoring very loud, so he got her out of her crib and held her for a while," charges state.

Investigators found that Holbert left pills on her nightstand in her room in small plastic zip-close bags to take when she got up in the morning. However, when Holbert was interviewed, she indicated that she was not missing any pills on the morning of E.K's death, charges state.

The felony with which Kimber is charged carries a potential punishment of up to 15 years in prison.

The misdemeanors could land Holbert in jail for up to a year on each count, if she is convicted as charged.