INDIANAPOLIS, Ind. - A Marion County Sherrif's Office Deputy died at the hospital after an assault by an inmate he was transferring. 

According to police, Deputy John Durm was returning from transporting an inmate for a hospital visit at 11:30am when that inmate, Orlando Mitchell, 34, attacked Durm inside the sally port of the Adult Detention Center. 

The inmate then stole the transport van, crashing it into a utility pole on Prospect Street. The suspect was taken into custody.

Marion County Sherriff Kerry Forestal confirmed that Deputy Durham died at the hospital.

"It is with deep sadness that we must report that the Deputy initially involved in the altercation with an inmate has passed away from his injuries. Deputy John Durm faithfully served the people of Marion County as a Deputy Sheriff for almost four decades. In that time, he set himself apart as an honorable and faithful public servant.

But he was more than that. He was a husband, a father, and a friend. Our hearts are broken for his wife, Ramona, also a dedicated Deputy here at the MCSO, and his children who have continued his legacy of service."

Deputy John Durm was 61-years-old. 

The suspect will be arrested for murder once he is released from the hospital, according to police.