A man sitting on Alabama Death Row died Sunday after being in “physical distress,” according to a prison spokesperson.

William Marshall, 58, was sentenced to death in 2005 after being convicted of capital murder in Jefferson County for killing his stepdaughter, Alicia Nicole Bentley, in 2004. Alicia was 15 years old.

He was being held on the state’s death row, located inside William C. Holman Correctional Facility.

Marshall was taken to a hospital near Atmore, where Holman is located, “following a report of physical distress,” said Alabama Department of Corrections spokesperson Kelly Betts. He was then transported to a hospital in Dothan after medical staff in Atmore determined he needed a higher level of care.

“His condition deteriorated and he became unresponsive. Staff was unable to revive him, and he was pronounced deceased,” Betts said. She added that Marshall “had suffered from multiple ongoing health issues.”

The ADOC Law Enforcement Services Division is investigating Marshall’s death.