Camron Smith was allegedly chased and stabbed after answering the door to a group of males on Bracken Avenue at around 12.45am on Thursday, July 1.
He was treated at the scene but was pronounced dead a short time later.
A 15-year-old male was charged on Wednesday, November 3, with murder, robbery and conspiracy to commit grievous bodily harm.
He will appear in custody before Bromley Magistrates’ Court on Thursday, November 4.
Three males, aged 15, 16, and an 18-year-old named as Romain La Pierre, of no fixed address, have been previously been charged with Camron’s murder.
A 20-year-old man has been released under investigation.