RAPID CITY, S.D. (Rapid City Journal) — A senior airman stationed at Ellsworth Air Force Base is now charged with murder after a baby he was accused of assaulting died. A prosecutor tells the Rapid City Journal that 26-year-old James Cunningham of Rapid City was charged Thursday with second-degree murder.

Cunningham earlier was charged with aggravated child abuse. The charge was upgraded after authorities say the baby died. Police say someone called 911 on March 3 to report the baby was unresponsive at a Rapid City home. Base officials say the incident occurred off base and that they are assisting law enforcement agencies with the investigation.