A 16-year-old boy, who cannot be named for legal reasons, has been charged with the murder of Louis-Ryan Menezes from Rothwell.
He will appear at Northampton Magistrates Court this morning (Friday).
A 17-year-old boy has been released on police bail.
The 34 year-old-woman and 37-year-old man arrested on suspicion of assisting an offender have been released under investigation.
Louis-Ryan, 17, died after suffering a stab wound to the chest in Kingsthorpe, Northampton, last Friday.