Harry Pitman murder: New images released after boy, 16, stabbed on New Year's Eve

Harry Pitman , 16 , was stabbed to death on New Year's Eve on Primrose Hill , London .

Police have released images of two men they want to identify and speak to.

A 15-year-old boy was held on suspicion of murder on Tuesday , while an 18-year old man was arrested for affray.

Harry 's older sister Tayla described her brother as a "good boy" who had a "heart of gold".