A teenager who fell 70ft from a rooftop may have climbed through a skylight for a cigarette.

The 19-year-old, who lived at the address, was last night still fighting for his life at Royal Sussex County Hospital after suffering serious head injuries in the fall on Sunday afternoon.

A spokesman for Sussex Police said: “The 19-year old is in a critical condition at the RSCH. Police are not treating the incident as suspicious.

“It is believed he went out on to a flat roof via a skylight and slipped.”