A woman calmly called 911 to report her baby son wasn't breathing on Tuesday and then hours later confessed to killing him and her two other young sons over the past several months, police said.
Brittany Pilkington was charged with three counts of murder and was jailed Tuesday, said police in Bellefontaine, about 60 miles northwest of Columbus.
Pilkington, who's 23 years old, is accused in Tuesday's death of 3-month-old Noah Pilkington and in the deaths of 4-year-old Gavin Pilkington, who died in April, and 3-month-old Niall Pilkington, who died in July 2014. No working telephone number for her home could be found, and no attorney information was available for her.
Police said officers went to the family's apartment on Tuesday morning after an emergency call from the mother saying that Noah wasn't breathing. They said she calmly answered a dispatcher's questions while the baby's sleep apnea alarm beeped in the background. The baby was pronounced dead at a hospital.
Authorities already were investigating what happened to Niall and Gavin, whose causes of death still hadn't been conclusively determined. In each of those cases, their father, Joseph Pilkington, found them unresponsive when he got home from work.
"Our son's not breathing," Brittany Pilkington said meekly to a dispatcher when she called police on April 6 as her husband frantically gave Gavin chest compressions. "He's turning white."
Joseph and Brittany Pilkington were cooperative on Tuesday, police said. She eventually told detectives that she killed all three children, police said, but no other details of officers' discussions with her were released.
"The tragic deaths of Niall, Gavin and Noah leave a pit in our stomachs today," police Chief Brandon K. Standley said in a statement. "Our condolences go out to the remaining family members who have supported this family through a very difficult 13 months."
The Ohio Bureau of Criminal Investigation is assisting local authorities.