Florida ? Guards at a juvenile detention center allegedly assigned a teenage sex offender to bathe and change a severely mentally retarded boy, who was then raped by the offender, police said.

Lee Donton, 17, was charged with sexual battery on a child after two other teens in the detention center reported twice seeing him rape the disabled boy, 15, who a relative said was autistic.

Juvenile Justice Secretary Anthony Schembri said it was against department policy to have one youth take care of another for any reason.

“We’re going to get to the bottom of this, and heads are going to roll,” Schembri said.

The detention center supervisor, Linda Edward-Ellis, has been suspended with pay. Shift supervisor Lt. Don Williams was fired Thursday.

One of the assaults happened in a shower where Donton had been assigned to bathe the boy. The other occurred in the disabled boy’s cell where Donton was changing the boy’s diaper, according to police reports.