Members of the public should not approach Keith Whitehouse he is serving a life sentence for manslaughter and kidnap.
He has escaped from prison staff at HMP Leyhill in South Gloucestershire noticed he had absconded when he failed to attend a roll call which is held at 8.15pm in Saturday Night.
Prison staff last noticed him at 4.45pm on the same day.
While he was previously on home release for the offence of kidnap Whitehouse committed manslaughter due to this fact he is considered as highly dangerous and should not be approached.
Whitehouse is described as white, 6ft 5in tall and of a slim build.
Whitehouse has short grey hair, a grey moustache and goatee beard, and an eagle tattoo on his left arm and a leopard on his right arm.
Police believe a man matching his description was spotted in the early hours of Sunday morning on the A38 between Claypits and Slimbridge, around 10 miles from the prison.
Avon and Somerset police believe that Whitehouse has links with the West Midlands and Brighton and could head to either of these areas.
Police say that anyone who sees Whitehouse should not approach him, but instead call them on 999 and quote incident 23 of 18 February.