Authorities in Wisconsin are charging an Oshkosh woman with the murders of three babies over a span of five years more than three decades ago.

Each of the deaths had initially been attributed to sudden infant death syndrome.

According to Fox News, 60-year-old Nancy Moronez allegedly killed a 2-week old boy in 1980, a 6-month-old boy four years later, and a 2-month-old girl the year after that.

The youngest victim was reportedly her biological child and she had been hired to babysit the other two infants.

Police say the suspect’s daughter raised concerns several years ago, leading to the investigation into the three deaths being reopened.

According to the daughter’s testimony, Moronez “admitted to her that she had killed her son.”

Though the mother and daughter reportedly agree on the basics, they describe different modes of murder.

The daughter said her mother claimed she suffocated the boy with a garbage bag while Moronez reportedly told police that she drowned the victim.

She reportedly confessed to the murders during an interrogation earlier this month, blaming her actions on disruptive babies, as reported by WITI.

“I can’t take kids that constantly cry,” the babysitter told police, according to court documents.

Moronez reportedly told investigators that the 6-month-old victim made her “frustrated,” admitting that she used a blanket to hold “real tight against the face” of the victim until he died.

The female victim was killed the same way about a year later, she reportedly confessed.

Reports indicate Moronez was booked into jail with with bond set at $35,000. If convicted of the charges being pursued against her, she could face 20 years behind bars for each of the three murder counts.

[Featured image:Nancy Moronez/Milwaukee County Jail]