A third man last Friday admitted taking part in the robbery and kidnap of Leicester jeweller Ramniklal Jogiya.
Charles Frances Mcauley, (20), appeared at Birmingham Crown Court where he pleaded guilty to the two charges. He is also charged with murder and manslaughter of the 74-year-old man. He formally denied this charge.
Mr Jogiya was reported missing by his family when he failed to return home having locked up his shop, Vama Collections, in Belgrave Road on the evening of Wednesday, January 24. His body was found the next morning in Gaulby Lane, Stoughton.
Two men appeared in court last month to admit taking part in the robbery and kidnap, Leicestershire Police said.
Thomas Jervis, (24), and Callan Reeve, (20), both denied murder and manslaughter. A fourth man, 30-year-old Javon Roach, has pleaded not guilty to murder and manslaughter as well as charges of kidnap and robbery.
All four defendants have been remanded in custody and are due to stand trial at Birmingham Crown Court.