The family of a milkman critically injured in an attack near his home issued new images of him in a bid to get more information on what happened.
Robert Bullock, 62, known as "Bob", was attacked exactly one month ago after disturbing three men wearing balaclavas near his van in Brinklow, Warwickshire, on the afternoon of Sunday April 25.
He has lost the sight of one eye, and is still critically ill in hospital.
In an emotional plea for information issued through Warwickshire Police, his wife Sandra said: "He was a healthy fit man. This hasn't just ruined his life, but this has ruined my life and affected so many people.
"Nobody can believe it. I am trying to be strong for my daughter. I keep thinking he's still alive, he's still there, I've got to fight.
"We cannot believe this has happened to us. Please help us find out who did this to Bob."
His family have released images of Mr Bullock at a cancer charity dinner last year in Coventry.
Detective Chief Inspector James Essex said: "Bob remains in a critical but stable condition in hospital almost a month after he was assaulted on April 25, a Sunday afternoon in Brinklow, and we are extremely concerned for his welfare.
"He has lost the sight of one eye and is in a very serious condition indeed.
"We believe someone out there knows exactly what happened on that Sunday afternoon and we are asking them to search their conscience and call us with any information they may have."
He said they were keen to piece together the whereabouts of a black Ford Focus believed to have been used by the offenders.
The car was captured on CCTV cameras in nearby Rugby the day before it was stolen.
On April 25, it was reported stolen from outside a property in Attoxall Road, Coventry.
At around 3pm that day, Mr Bullock is believed to have disturbed three men near his van parked in Walkers Terrace, Brinklow.
The men, all wearing balaclavas, assaulted him with an unknown object before making off in a black Ford Focus in the direction of Ansty, Warks. Police recovered a hammer from the scene.
Three days later, the car was found abandoned and set alight near the canal not far from the Greyhound Public House in Longford.
Police said they were continuing to trawl CCTV footage from the time the car was reported stolen to find where it was used and who was driving it.
Mr Essex added: "We need your help to find out where the black Ford Focus was between the time it was stolen from Attoxall Road in Coventry on Sunday, April 25, and when it was found burnt out in Longford, Coventry, on April 28.
"We are determined to find those responsible. Officers in the Tile Hill area of Coventry have been visiting around 150 homes to speak to the people who were on Bob's milk round to find out if they have any information that could help."
He urged anyone with information to contact police on 01926 415761 or Crimestoppers anonymously on 0800 555 111.Reuse content