A man who was stabbed at Seven Sisters Tube Station a week ago has died in hospital, police have confirmed.Ervin Baraku, who was in his 30s, was rushed to hospital while suffering with stab wounds on Tuesday July 23.British Transport Police charged a man, 20-year-old Milumo Pedrinho, with attempted murder and he was remanded in custody on Monday at court.But police said on Wednesday that Mr Baraku died in hospital this morning, and a murder investigation has now been launched.