Convicted Cheshire triple-murderer Steven Hayes was found unresponsive in his prison cell on Monday morning.
Staff members found Hayes in his cell at Northern Correctional Institution in Somers around 9:30 a.m., according to the Department of Correction. He was the only inmate in the cell at the time.
Medical personnel performed live-saving measures and Hayes was rushed to the hospital. He is reported to be in stable condition, officials said.
Hayes is one of two men convicted in the 2007 murders of Jennifer Hawke-Petit and her daughters, 17-year-old Hayley and 11-year-old Michaela inside their Cheshire home.
He was convicted of the crimes and sentenced to death in November 2010.
The Department of Correction is investigating Monday morning's incident.