BARTOW — A 63-year-old Polk County Jail inmate died early Tuesday morning at Bartow Regional Medical Center.

Martha Collier of Lake Alfred was transported by EMS from the Central County Jail infirmary to Bartow Regional Medical Center after she began having breathing difficulties at the infirmary. She was declared deceased at 5:35 a.m.

Collier had ongoing medical issues including schizophrenia, hypertension, high blood pressure and anemia. Collier was admitted into Lakeland Regional Health Medical Center in December and was diagnosed with a uterine mass.

At approximately 4:41 a.m., medical staff at the Polk County Jail Infirmary called 911 because of a decline in her condition related to breathing issues and a high heart rate.

Collier was arrested by Polk County Sheriff's Office and booked into the Polk County Jail on April 4, 2017, for neglecting elderly/disabled adult with great harm). Detectives determined that Collier neglected her elderly sister while she was in her care.

Collier was sent to the Florida State Hospital in Chattahoochee in June and returned to CCJ on October 16.

An autopsy is tentatively scheduled for Wednesday to determine her cause and manner of death.

The PCSO has opened a death investigation.

All of the investigative findings will be forwarded to the State Attorney's Office for review.