The leading private prison company in the U.S. has spent more than $4.4 million to settle dozens of complaints alleging mistreatment — including at least 22 inmate deaths — at its Tennessee prisons and jails since 2016.

More than $1.1 million of those payouts involved Tennessee’s largest prison, the long-scrutinized Trousdale Turner Correctional Center, which is now under federal investigation.

Details of nearly 80 settlements provided to The Associated Press through public records requests allege brutal beatings, medical neglect and cruelty at CoreCivic’s four prisons and two jails in Tennessee.

In one case, a Trousdale inmate who feared for his life beat his cellmate, Terry Childress, to death to get transferred to a different prison, the federal lawsuit says. No guards came to Childress’ aid at the chronically understaffed facility, the suit claims. Childress’ family received a $135,000 settlement.