Hokkaido police arrested a 46-year-old woman Tuesday on suspicion of murdering her 6-year-old son at their home in the city of Sapporo.

The suspect, Yukie Kamii, a self-described part-time worker who lives in the city’s Teine Ward, is accused of strangling her son, Yusho, a first-grade elementary school student, sometime between Monday morning and evening, according to reports by Hokkaido Television Broadcasting.

According to police, Kamii called emergency services at around 7:40 p.m. that day, telling operators: “My child is dead. I killed him.”

Officers who arrived at the home found the boy unconscious and not breathing. He was taken to a hospital in the city, where his death was later confirmed.

Kamii has since denied the allegations, telling police, “I did not kill my son,” despite her initial statement.…