OFFICERS travelled to Nike in America in a bid to identify the bloody footprints left in Heather Barnett’s flat by her killer.

A Nike expert, who appeared as a witness in the OJ Simpson trial, revealed the footprint belonged to a pair of Nike Terra-Part trainers, which was produced in four basic colours - black, white, blue and red.

His information revealed the trainer worn by the killers was between size nine and ten.

Extensive enquiries were made to find out where such a shoe was sold in the UK and who bought them.

Detectives also discovered such a shoe was sold on the black market and there was no way of finding out who to.

Det Supt Cooper said: “It was a massive task and unfortunately didn’t get us anywhere.”