The 18-year-old was sentenced to at least 20 years in Guildford Crown Court despite his denial of the charges.
In May of last year, Kyle Wright, then seventeen, was fatally stabbed in the street by Cox after they encountered one other at a party on Green Hill Road in Camberley.
After Cox’s conviction, police said that a “minor feud” between young people served as the impetus for the attack.
Valerie Wright, the mother of Mr. Wright, talked of her sorrow and said she had never considered having to bury her son in a statement read aloud in court.
She said: “I will never have the opportunity to hold him in my arms, tell him I love him, watch him graduate, see him walk up the aisle, and succeed in life. Jonathan Cox cruelly thought he had the right to take all of this away.”
The court heard testimony during the trial on how the police assembled CCTV evidence to determine Cox’s whereabouts on the night of the murder.
Photos showed Cox walking to Green Hill Road from his residence in College Rise, Camberley, riding to the scene, and then confronting Mr. Wright and his pals outside the house party on the road.
Mr. Wright was fatally stabbed in the chest, and although paramedics attempted to save him, the adolescent passed away at the site.
According to the police, Cox was recognised by CCTV footage of him riding away.
The video also showed him entering and leaving his house following the murder; according to the prosecution, these were the moments when he threw away his clothes, cell phone, bicycle, and knife that were used in the assault.
None of the property was ever located, according to the police, despite their best efforts to search.
Cox was also fined £190 as a victim fee and given a concurrent six-month sentence for carrying a bladed object in public.
The court ordered the forfeiture of a machete, knuckledusters and drugs found in his bedroom.
Det Insp Simon Dunn said following the case: “Cox went to the scene armed with a knife that night with the intention of causing him serious harm.”
He praised Mr Wright’s friends who witnessed the attack and went to his aid, adding: “The memories of that night will have had a significant impact.”
Mr Dunn noted the judge found Cox had an “unhealthy preoccupation with knives and the damage they inflict” and described him as “a very dangerous person”.
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