Police have arrested Arizona-resident Amber Sagarnaga, 23 for murdering her 5-month-old infant daughter, according to KSAZ.

Sagarnaga is being accused of smothering her baby to death with a blanket on June 9, just because she was crying. The infant’s father, who is engaged to be married to the accused, called 911 on Friday night, frantically reporting that the infant was unresponsive and saying that his fiancé was “lacking emotion,” according to court documents acquired by The Arizona Republic.

The 5-month-old was transported to a local hospital where she was pronounced dead.

The accused reportedly admitted to investigators that she placed a heavy comforter over the baby’s head and pushed down on her face to get her to stop crying. Her daughter continued to cry, so she left the comforter over her face for several hours.

Authorities have stated that the slain infant appeared to be suffering from neglect. Officers alleged that the baby had a “soiled diaper, which appeared to have been on for more than a day” and a severe diaper rash.

The Arizona Department of Child Safety also confirmed that Sagarnaga had long been under investigation, when the agency received a report regarding Sagarnaga and her use of marijuana while she was pregnant.

The 23-year-old has two other children. Reports claim that she considered both killing herself and killing her three children “because she couldn’t take it anymore.” Her fiancé reportedly told police that Sagarnaga suffers from depression and self-medicates with marijuana.

The accused’s other two children, ages 2 and 3, are currently in the custody of the Department of Child Safety.

Sagarnaga was arrested early Saturday and charged with second-degree murder. She is being held in a Maricopa County jail on a $500,000 bond. Her next court appearance is scheduled for June 16.

A full autopsy will be performed to determine the 5-month-old’s official cause of death.

[Featured Image: Maricopa County Sheriff’s Office]