Maggie Mae Bennett, 40, has served 17 years of her 19-year sentence for conspiracy and is scheduled to be released on Oct. 10.
Maryann Measles was preparing to accuse two of the men involved in her murder of statutory rape when she was kidnapped, beaten raped and drowned 22 years ago.
Measles' sister called Bennett’s release “sickening.”
Bennett was previously denied early release.
The Associated Press contributed to this report.