A grand jury indicted Sidney Landers on Monday for first-degree murder in the death of his girlfriend's 3-year-old daughter.
The girl died after suffering bruises and broken ribs at the hands of her caregiver.
Phoenix police report that on Sunday they received word from medical staffers at Phoenix Children’s Hospital of a 3-year-old girl who had been abused.
Hospital workers reported to police that Morgan Koepp had multiple bruises on the "front and back of her torso," a swollen cheek and "multiple broken ribs."
The victim’s mother brought the girl to the hospital after noticing her swollen mouth. Police say the girl was in the care of her mother's boyfriend, 33-year-old Sidney Michael Landers.
When interviewed, Landers reportedly told police that the girl was ill the previous day and he became, "frustrated because the victim had several accidents in her pants and would not sit still when he cleaned her."
He said he held his hand over her mouth while she screamed during her diaper change.
Landers was arrested the next day at his home near 12th Street and Northern Avenue.
He is being held on a $150,000 bond for child abuse.