Shaniqua Pierre of Deptford entered her plea Monday to an aggravated manslaughter charge. She faces a 25-year prison term.
She's one of 10 people charged in the deaths of 18-year-old Muriah Huff of Cinnaminson and 23-year-old Michael Hawkins of Mount Holly. Pierre is the fifth to plead guilty.
Prosecutors say Pierre and another woman who previously pleaded guilty beat Huff with pieces of a chair, stabbed her and strangled her with rope.
Prosecutors say Hawkins was beaten and shot in a gang dispute and Huff was killed to prevent her from identifying the attackers.
The couple's bodies were buried in the backyard of the row home where they were killed in February 2010.