A second man has been arrested on suspicion of taking part in an armed raid at a bank more than 25 years ago.
Three robbers stole £7,500 from Lloyds Bank in Cromford, Derbyshire, on 18 September 1985.
Derbyshire police have arrested a 63-year-old man from Ironville, Derbyshire, and released him on bail pending further inquiries.
In December 2010, Alan Murray, 59, of Pilmoor near York, was jailed for 10 years for his part in the robbery.
During the robbery, security guard John Power, 61 at the time, was hit in the face with a shotgun.
He suffered facial injuries and was taken to hospital for treatment.
The offenders left the scene in a Ford Escort, which was later found abandoned in Market Street in Belper.
Murray pleaded guilty to robbery, causing grievous bodily harm with intent and possessing an imitation gun.
He was caught after fingerprints found at the scene, and on paperwork used to hire the getaway car, were matched to a new national database.