THE dad of a five-year-old boy stabbed to death has paid a heart-breaking tribute to his son.

       Devastated dad Dorinel Lazar promised his son: "We'll never forget you".

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       Dorinel shared a picture of David-Mario in happier times Credit: Facebook

       He posted the message alongside a picture of his son, David-Mario, on Facebook this afternoon.

       The heart-warming pic showed his son posing during a day out in the park, giving a cheeky thumbs up.

       Dozens of friends posted messages of support, telling Dorinel they were praying for the little boy.

       The picture was posted after his devastated parents Cristina and Dorinel said in a statement: “Our son, he was the most beautiful child in the world. He was a very happy boy.

       "He was always smiling from when he woke up to when he went to sleep. He had so much energy. He loved to dance and sing.

       "He is all of our hearts, all our love and is everything to both of us.”

       The tribute comes after The Sun revealed Mario’s gran, Elena Anghel, has been detained and sectioned following his death.

       The 49-year-old was held under the Mental Health Act.

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       She was initially arrested on suspicion of murder over the five-year-old boy's death with police today confirming she had been sectioned.

       Five-year-old David-Mario was found dead at his home in Earslsdon, Coventry, on Tuesday with a stab wound.

       Anghel had been initially arrested on suspicion of the murder of the boy after she was allegedly looking after him when he died.

       A close pal of the family said: "The mother was at work when it happened, and her husband was, too. The grandmother was the last person to see the boy alive.

       "No one can understand how she came to have a knife in her hand. We just don't know why.

       "When I met her, she was always OK. She didn't ever present any signs of a mental illness."

       Anghel was well liked by locals in the Earlsdon area of Coventry.

       Another friend said: "I've known Elena for many years. I've let my daughter stay with her when my wife and I have gone out. She is a very good person."

       A post mortem examination confirmed David-Mario died from a knife wound.

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       David-Mario's parents vowed they would never forget him Credit: PA 3

       The youngster's gran has been detained under the Mental Health Act Credit: SWNS