MILWAUKEE (WTAQ) - Milwaukee authorities want to use Wisconsin’s sex offender confinement laws to keep holding a man whom they believe killed a 9-year-old neighbor girl in 1970.

Prosecutors say they don’t have enough evidence to convict 73-year-old Robert Hill for the actual murder. But he just finished a prison term for molesting four young girls – and he’s being held at the Sand Ridge Treatment Center in Mauston because he’s still considered a threat to society.

A court hearing will be held November 19th on whether Hill should be committed indefinitely for psychiatric care.

Hill lived next to 9-year-old Donna Willing when she was raped and left underneath a car inside a garage on Milwaukee’s west side. The case remained unresolved for almost a quarter century before the victim’s sister asked police in 2004 to re-investigate.

A new petition for the confinement said Hill confessed to raping and killing young Donna – and he gave details about the crime that only the police knew – before he recanted the confession a few years later.