State police are investigating the March 25 untimely death of an inmate at Garner Correctional Institution, the state's high-security prison for males at 50 Nunnawauk Road.

Dead is Jallen Jones, 31, an inmate who was serving a ten-year sentence on convictions for charges including first-degree robbery.

The state Department of Correction's (DOC) security division is assisting state police in the investigation, according to a DOC statement.

The results of an autopsy, which was performed on Jones's remains to determine the manner and cause of death, are "pending further study," a spokeswoman for the Chief State Medical Examiner's Office said March 26.

According to the DOC statement, at about 11:05 am on March 25, Garner's health services staff determined that Jones required treatment and some increased supervision at the prison's in-patient mental health unit. Garner is the state prison that specializes in providing acute mental health care to state prison inmates.

"During escort and placement into [the unit], inmate Jones became noncompliant and combative with staff, and then became nonresponsive. Life-saving measures were immediately initiated and Jones was transported via ambulance to a community hospital, where he was declared deceased at approximately 12:25 pm," according to DOC.

DOC Commissioner Scott Semple said, "The death of an individual under the care and custody of the Department of Correction is a very serious matter, and we are fully committed to cooperating with external law enforcement."

The commissioner added,"There are no immediate indications suggesting that excessive force was utilized. However, we are in the infancy stage of an active investigation and will respond swiftly and accordingly to any determinations contrary to the initial findings presented," he said.

Jones had been incarcerated since September 2014. He was sentenced in May 2015. He was from Atlanta, Ga.

The Chief State's Attorney's office is participating in the investigation into Jones's death. The exact manner and cause of death will be determined by the medical examiner's office, according to DOC.