Majors, 18, was killed during a robbery while walking through Morningside Park on Dec. 11, according to police.
The 13-year-old boy was arrested shortly after Majors' death. Two 14-year-olds were arrested in connection with the case in February. The suspected stabber, Rashaun Weaver, was charged with two counts of murder in the second degree, including one count as intentional murder and one count as felony murder. The other suspect was charged with one count of murder in the second degree as a felony murder.Both pleaded not guilty.