A CCTV image of escaped prisoner Shaun Walmsley has been released by police as they continue to search for him.
Convicted murderer Walmsley, 28, went on the run on February 21 when two men armed with a knife and a gun confronted prison officers guarding him at Aintree University Hospital in Liverpool during a visit from HMP Walton.
A gold-coloured Volvo which was used for the escape was later found abandoned in the Fazakerley area of Liverpool.
On Friday detectives released a new image showing Walmsley at the hospital.
Detective Superintendent Natalie Perischine said: "The new CCTV image, which was actually taken from hospital CCTV on the day of the escape, shows that Shaun Walmsley has lost a considerable amount of weight, and as a result looks very different to the image of him which was released after he was convicted of the murder of Anthony Duffy.
"Detectives are currently working with officers from the National Crime Agency and police forces in Europe and further afield to locate Walmsley and put him back behind bars."
Earlier this week Merseyside Police released a picture of a silver Hyundai i10 which was seen in the Fazakerley area in the hours after his escape.
A force spokesman said the car "may provide vital clues as to his whereabouts".
Ms Perischine said: "I would like to reiterate that Shaun Walmsley, and the two others involved in the incident, are dangerous individuals and we will be relentless in our pursuit of them.
"We are determined to find Walmsley and put him back behind bars. And we are also committed to finding the offenders who helped him escape, or anyone who may be harbouring him, so that we can put them before the courts."
Walmsley was serving life with a minimum term of 30 years for the murder of Anthony Duffy, 33, in May 2014.
Detectives are advising the public not to approach him if they see him.
Six men and one woman have been arrested in connection with the escape and released pending further inquiries.
Officers urged anyone with information to contact the police on 999, or Crimestoppers, anonymously, on 0800 555 111.