The public are being urged not to approach a convicted murderer who has escaped from prison.
Police say Thomas Parkinson 'could be violent'.
Anyone who sees him should call 999 immediately.
Parkinson, 31, who has links to Bolton, was convicted of murder and jailed for life in April 2007.
Then aged 19, he stabbed a 23-year-old man in the back house after a house party he had gatecrashed in Preston
The victim, Shaun Higgins, was pronounced dead later in hospital.
Lancashire Police has revealed Parkinson absconded from HMP Kirkham - a category D training prison in Lancashire - on April 24.
Details have only just been revealed.
Parkinson was jailed for life by a judge at Preston Crown Court after he pleaded guilty to murder and was ordered to serve a minimum of 11 years before he could apply for parole.
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A Lancashire Police spokesman said: "He is described as white, 5ft 7ins tall, slim with cropped brown hair and green eyes.
"Parkinson has links to the Warrington, Widnes and Bolton areas.
"Police are appealing for information and advising people not to approach him. We would urge anyone with information about Parkinson's whereabouts to contact us.-
"Parkinson could be violent and we would ask anyone who knows where is not to approach him but to call police immediately.
"Furthermore, we would encourage Parkinson, if he sees this appeal, to do the right thing and come forward."
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