Moment killer laughs on night bus after stabbing student to death in south London

Dino Donaldson, 21, was caught on CCTV on an N87 bus smiling and laughing - (ES composite)

This is the moment a murderer laughs on a night bus less than an hour after stabbing a university student to death on railways tracks in south London.

Dino Donaldson, 21, was caught on CCTV on an N87 bus smiling and laughing after killing Anojan Gnaneswaran, 21, at Strawberry Hill station in Twickenham.