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