Each defendant faces at least one murder count in the 22-count indictment made public Wednesday. It was handed up earlier this month by a Camden County grand jury.
The charges stem from the deaths of 23-year-old Michael Hawkins of Mount Holly and his 18-year-old girlfriend, Muriah Huff of Cinnaminson, in February 2010.
Authorities say Hawkins was beaten, shot and fatally stabbed in a gang-related dispute. The assailants allegedly beat Huff with a broken chair, stabbed and strangled her.
A tenth defendant, now 15 years old, agreed to have her case waived to adult court and pleaded guilty in May to aggravated manslaughter.