The mother of Dean Mayley who was stabbed to death says she is living a nightmare every day of her life with a family that will never be the same again.
Michael Mensah, 18, Ryan Beresford, 19, and Miguel Leiba, 17, were convicted of manslaughter and the four criminals will be sentenced on October 2.
Mr Mayley, who suffered from microcephaly which led to him having learning difficulties and a mental age of nine, was stabbed in the heart during an attack in Ruislip Road, Greenford.
The victim’s mother, Donna Mayley, has given a heart-breaking statement about the loss of her son and her inability to grieve.
She said: “I have not been able to grieve for my son or even talk about this horrific ordeal as my two eldest children, Sam and Laura, suffer from learning disabilities. I have been unable to tell them the truth about what happened to their little brother as my children become distressed when I show my emotions.
“Sam was recently hospitalised as he had a psychotic breakdown. He cannot understand how he has lost his father and little brother in the space of eight months.
“Laura has started to have violent outbursts, pulling her hair, and is severely distressed as she misses her brother terribly.
“I have to lie to my children every day as they would not understand that someone could hurt another human being in this way.”
Mrs Mayley said her son had only just started travelling alone as he used to travel around with his dad until the latter died in June last year (2013).
She added: “Dean was Emma’s closest sibling. Since Dean was so cruelly taken away from us it feels as though a part of her is missing. Emma’s three children were also very close to Dean. Callum and Dean were inseparable.
“The youngest of our family has had his life cut short for no reason and we will all struggle to come to terms with this for the rest of our lives.”
Mr Mayley, who lived in Northolt, was walking home when the four defendants, out in Mensah’s Fiat Punto, were out looking for victims to rob at knifepoint.
It is thought Mr Mayley caught their eye due to his distinctive North Face jacket and because he was alone.
They pulled over and Jones, Leiba and Beresford got out, Jones armed with a knife.
Jones approached the 24-year-old while the others blocked any chance of him escaping.
It is thought Mr Mayley’s condition meant he did not understand what was happening and did not hand over any of his property during the confrontation.
Jones stabbed him straight into his heart before all three ran back to the car.
Mr Mayley collapsed in the street and despite the best efforts of the London Ambulance Service, called by passers-by, he died two hours later at St Mary’s Hospital.
Dean staggered into the street and collapsed. Passers-by went to help him and police and the London Ambulance Service attended at 17:50hrs. Despite their best efforts he died less than two hours later in St Mary’s Hospital at about 7pm.
Mensah and Jones were arrested on February 15 at their homes and Beresford and Leiba two days later after detectives released CCTV images of them leading them to hand themselves in.