Mr Charkaui, 57 died in the JR2 hospital on Friday night as a result of the head injuries he suffered in a brutal attack with a spade in his Aylesbury home on March 12.

Rajae El Mouhandiz, who lives in Holland has made an urgent appeal for anyone in the UK with any information about the attack on her uncle to come forward.

She said: “We are all paralysed by the knowledge that my uncle was murdered by heartless murderers. Please create noise for my uncle’s case, he didn’t deserve to be killed like that. An innocent couple was attacked in their home in a vicious way and an innocent man was killed just like that, with a shovel or a spade.

“He was a remarkable person who was a good British citizen, a hard working, decent, honest, family oriented, loyal and goodhearted man and he didn't deserve to die like this,” she added.

Abdel-Ali El Mouhandiz, Mr Charkaui’s cousin, said: “We had planned for the next coming summer holidays to make a round trip trough Morocco especially to Al-Tain, I realise now it will never happen.

“You were, beside an uncle, a father figure and a friend for me to whom I could say everything. I have never seen you angry or mad about anything. The smile in your face was always there and did never leave you whatever the circumstances were.

“I am hoping the people who stole you from us, will realise what kind of act they did to us all and if it all was worthwhile.”

Mustapha had worked as a cleaner at Stoke Mandeville Hospital since 1989 and was a popular employee.

A statement on behalf of staff on Ward 8 who knew Mr Charkaui said: “Mustapha, who we affectionately knew as Chris, was a fantastic worker, colleague as well as friend to many on Ward 8 and throughout Stoke Mandeville. Chris was truly irreplaceable and we are devastated - all our thoughts are with Chris' family and friends at this time.”

The nurses on Ward 9 added: “We came across him many times on a normal working day. He always had a smile and a cheery 'hello' for you, even if the weather was terrible or it was very early. He was a kind man. Our thoughts are with his family at this terrible time, his death is a great loss.”

Ahtiq Raja, a work colleague and friend of Mr Charkaui, said: “Sometimes it is not what people do that counts, sometimes it is not how they act that counts, or how they react that counts, sometimes it is simply what they say that is remembered throughout one’s life.

“Mustapha was an individual whom would not say very much but when he did he spoke passionately and with pride.

“A hardworking gentleman full of aspiration and self belief. He will be dearly missed by a work colleague and most significantly a friend.”

Suzanne Beck, facilities director for Sodexho Healthcare at Stoke Mandeville Hospital, said: “During his 18 year service with the NHS and more recently with Sodexho Healthcare he was a well known, respected and diligent employee, colleague and friend.