A teenager pumped with steroids brutally murdered a dad in a frenzied knife attack on the street, a court heard.
Former boxer, Tony Robertson, 19, set upon 45-year-old Lee Knott whose van was flagged down by someone he recognised, caught in a row with him.
Pulling over to offer the man and his girlfriend the chance to drive away from Robertson, window cleaner Lee handed over his keys and decided to walk home instead.
Robertson however chased Mr Knot down and stabbed him six times in Wythenshawe, Manchester on September 22 last year, MEN reports.
"Mr Knott was to pay for this kind gesture with his life," Judge Suzanne Goddard QC said.
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Robertson was sentenced to life in prison, to serve a minimum of 20 years for the "senseless" and "brutal" killing.
Manchester Crown Court heard Robertson turned to taking triple the recommended daily dose of steroids as well as abusing cannabis, cocaine and ketamine when he started losing boxing fights.
The previously "hard working" and "decent" Robertson became aggressive and had been involved in "violent encounters" in the months prior to the murder.
After Mr Knott let the couple drive home in his van, Robertson then turned on him, believing he was "associated" with them.
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Prosecutors said Mr Knott "rather misjudged" Robertson, who had a concealed knife.
After Robertson said he would "fight" and "batter" him, Mr Knott said: "I'm not f****** dealing with any of your s***, just f*** off."
Robertson issued threats and replied: "What did you say, come and say that to me."
Mr Knott said: "Okay then, don't f****** move, stay there. I'm going home but I will be back."
Then Robertson "completely lost his temper" and pursued Mr Knott on Royal Oak Road.
When saw Robertson had a knife, Mr Knott said: "A knife, what the f*** are you doing with a knife?"
He ran but Robertson caught him, knocking him to the ground and stabbing him six times in a "frenzied" attack.
Robertson ran off, leaving Mr Knott for dead.
He later pleaded guilty to murder.
In a statement read to the court, Mr Knott's daughter, Jade Lanigan, said her family were left devastated.
She said: "For 19 years I had the privilege and honour of calling Lee my dad.
"It is very difficult for me and my two brothers, as we used to play with the person who did this to our dad.
"He will never meet any grandchildren, he will not see us succeed or get our dream job, and he won't be able to walk me down the aisle when I get married.
"We will all mourn the loss of our dad forever."
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