A NEW Channel Four documentary on 'cold cases' will unearth new evidence into the deaths of two boys in Birmingham, believed to be victims of Oswestry killer Brian Field.

Field was jailed for life in 2001 for the kidnap, rape and murder of Surrey schoolboy Roy Tutill in 1968 and had previously been jailed for four years in 1986 for kidnapping two teenaged boys on New Year's Day near Oswestry.

However, he has always denied any involvement in the deaths of two missing schoolboys who became known as the 'Milk Carton Kids' after disappearing in 1997.

Pals 11-year-old Patrick Warren and 13-year-old David Spencer disappeared after they went out to play and never returned on Boxing Day 1996.

The last known sighting of the boys was at a Shell petrol station in Chelmsley Wood, Solihull just after midnight, where an attendant gave them a packet of biscuits.

But 'In the Footsteps of Killers', a three-part documentary presented by Prof David Wilson, professor of criminology at Birmingham City University, and 'Silent Witness' star Emilia Fox, will take a more in-depth look at the case.

Prof Wilson said: "I wanted to do the ’milk carton kids’ – they were the first missing children to appear on milk cartons – because I started to teach in Birmingham in 1997.

"I couldn't get over the fact that two boys could simply disappear off the face of the earth.

The case came to prominence again in November last year when Human remains were found near a site which had previously been searched in the hunt for two missing children.

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Emergency services were called to Damson Parkway, in Solihull, in West Midlands, following the grim discovery as forensic teams could be seen searching the site, near car maker Jaguar's plant.

The pair also featured on BBC show Crimewatch to launch another appeal on the 10th anniversary marking their disappearance.

The show ill air on Channel Four on Wednesday, at 10pm.