IOWA CITY, Iowa (AP) — An Iowa inmate convicted of killing his infant daughter in 2010 has died in an apparent suicide. The Iowa Department of Corrections says 28-year-old Ryan Nicholas Trowbridge was pronounced dead Saturday afternoon at University of Iowa Hospitals and Clinic. Officials didn’t provide specifics about Trowbridge’s death but say an autopsy is planned and the Department of Corrections will investigate the death.

Trowbridge was serving a life sentence for first-degree murder after the 2010 death of his 4-month-old daughter, Rylee. Trowbridge told authorities he put his daughter on a bed for a nap in a home in Ankeny and then discovered her trapped between the headboard and mattress. Prosecutors say her injuries were consistent with being grabbed and shaken.