In an interview with detectives the suspect confessed to six other robberies in Indianapolis, along with one in Lawrence.
Officials say the incident happened in 2012, when surveillance video showed Carrico assaulting the inmate during processing.
DEA agents raided doctor's offices in Delaware, Howard, Hamilton and Wayne counties.
Charges filed against Jason Lee Caldwell include murder, robbery and rape.
Police are looking for a gray or silver 1996 Ford Taurus or Mercury Sable, possibly a station wagon, with front end damage.
Police say someone shot Ja'Vonne Ellis in the chest near 38th and Station Monday night.
Witnesses say the boy was riding his bike across the street, when a vehicle turned the corner and hit him.
“Seeing repeat offenders in and out and in and out, it has to stop. It just has to stop," said Indianapolis Mayor Greg Ballard.
Victor Wells has been arrested at least 23 times since 1988. He has spent more than nine years behind bars, mostly in short stretches.
One person was shot in the 3300 block of Carrolton Avenue.