robin Williams , 18 , has been charged with the murder of mark robin . Williams , of north London , has also been charged with conspiracy to rob . An 18-year - old boy remains in custody following robin 's death last Friday . A 17-year - old boy and a 21-year - old man have been bailed , police say . Alan was attacked on Caledonian street in north London last Friday night .
Joshua Williams , 18 , has been charged with the murder of Alan Cartwright . Williams , of north London , has also been charged with conspiracy to rob . An 18-year-old man remains in custody following Alan 's death last Friday . A 17-year-old boy and a 21-year-old man have been bailed , detectives say . Alan was attacked on Caledonian Road in north London last Friday night .