Welcome to the tales of Inspector Piper. Chronicle 6: Murder by Suicide

Inspector Piper is called to the scene of a suspected suicide of a jewellery shop owner, Cecil Groves. The shop keeper has been found hanging at the shop by his assistant Catherine Little. However, the shopkeeper had been the only witness to an armed robbery at the shop a few days earlier where he was able to identify the offender.

Can you work out what has happened? Was it an unfortunate accident...or was foul play used?