Former construction firm boss James Desborough, 40, killed inmate Steven Kempster, 65, in his bed at HMP Exeter in Devon in September last year.

Former construction firm boss James Desborough, 40, killed inmate Steven Kempster, 65, in his bed at HMP Exeter in Devon in September last year.

James Desborough, 40, is accused of murdering friends Daniel Coleman, 43, and Claudio Aquilino, 57, near his remote Cornish woodland cabin last year.