The expert spoke on episode two of Incident Room on Channel 5 - airing tonight at 8pm - which looks at the tragic case of Wendy Speakes, who was killed in Wakefield, West Yorkshire.
Robert Black: The child murderer who dumped body of girl, 11, in Staffordshire stokesentinel.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from stokesentinel.co.uk Daily Mail and Mail on Sunday newspapers.