Although DCI Frost is initially advised that a young addict found in a public toilet died by choking on his own vomit, he later learns that he was beaten to death.
David Jason - DI Frost Bruce Alexander - Supt. Mullett Neil Dudgeon - DC Costello David McKail - Dr McKenzie Felicity Montagu - Anne Butler Gerard Horan - Ray Butler Barry Jackson - Walter Peters Albert Welling - Dr Royce Patten Vivienne Ritchie - Linda Patten Marion Bailey - Eileen Grant Michael Feast - Trevor Hine Linda Bassett - Mrs Cornish John Lyons - DS Toolan Paul Moriarty - Sgt Wells Bill Rourke - Sgt Hanlon Stuart Barren - Sgt Johnson Jon Sotherton - DC Howard (as John Sotherton) Ewen Bremner - Gordon Hicks Christopher Penney - Ben Cornish James Saxon - Mortuary Attendant Caroline Harker - WPC Hazel Wallace Colin Buchanan - PC Austin George Thompson - PC Simms Christopher Rickwood - PC Stringer Tony Bluto - Security Guard Sue Cleaver - Patten's Receptionist Lorraine Peters - Butler's Neighbour
