MANSFIELD, Conn. -- A Mansfield foster mother was arrested on Thursday in connection with the death of an infant who was in her care.

Suzanne Listro, 42, was taken into the custody of state police on Thursday in connection with the baby's May death.

Police responded to Listro's home on May 19 after receiving reports that an unresponsive baby was being transported to Windham Memorial Hospital. The 7-month-old child was then airlifted to Hartford Hospital, where he pronounced dead.

The baby was identified as Michael Brown.

An autopsy revealed the cause of death to be blunt traumatic head injury. The death was ruled a homicide.

Listro was a foster care provider licensed by the Department of Children and Families. She was also an employee of the department.

DCF On Listro's Arrest

DCF said that Listro became a licensed foster parent in February, and that the baby had been in her care for a week before his death.

The department said Listro had worked for the department since 1993.

Commissioner of the department, Susan Hamilton, said that Listro had been suspended without pay, and that she was pushing for her termination.

She said that during the investigation into Brown's death, the department discovered that claims of abuse had been made against Listro in connection to her adopted child. She said that the accusations were never proven and that DCF is reviewing its policies.

"As commissioner of this agency, I not only feel the enormity of this loss but have the responsibility to do something about it and to assure the public that I have taken immediate and decisive action in response to my investigation into this case," Hamilton said.

Hamilton said that an internal review of the staff involved in the investigation of the previous abuse allegations was also being conducted by the department.

She said one of the investigators had been terminated and that another had received a 20-day suspension.

She said the department planned to begin outsourcing the licensing of any DCF employee who wants to become a foster parent. As of early June, there were 28 employees who held licenses as foster parents.

"I have and will continue to hold myself, my staff and the system accountable for any and all improvements within our control that are needed to prevent this from happening again," Hamilton said.

Listro's bond was set at $1 million. Channel 3 Eyewitness News reporter Erika Arias reported that Listro planned to make bond by offering up several properties.

Watch Eyewitness News at 5 for updates to this developing story.