An uninsured driver killed a nine-year-old boy playing on his bike with his older brother.
Ibrahim Waseem, 23, was jailed for 21 months after a court heard he was driving at nearly double the speed limit when he struck schoolboy Radwan Uddin, who was riding on the handlebars of his older brother's bicycle, near a park in East Ham, London.
Snaresbrook Crown Court was told that Waseem then hit a parked car so hard it was hurtled 20 feet down the road. Paramedics rushed to the scene and Radwan was taken to Great Ormond Street hospital.
However he suffered head injuries and died soon after.
The court was told that Waseem got out of his car and ran away, but was chased to his nearby home. He then called a solicitor, and turned himself in to police that evening.
Waseem admitted causing death by careless driving following the incident on June 26, 2012. His speed was a minimum of 39 mph in the 20mph zone, the court was told.
Judge Judith Hughes QC said: "This is far from an easy case in which to sentence because it is a tragedy for you and a tragedy for the victim's family.
"Clearly things can be said on both sides and it will not help the family to hear that the child was on the handlebars and that the older brother had been going down the road the wrong way.
"But unfortunately the fact is that you Waseem were going too fast and if you had been going less quickly the consequences might have been different.
"Clearly the speed and having no insurance are aggravating features but I accept you are extremely remorseful and take full responsibility for what has happened."
Judge Hughes sentenced Waseem to 21 months in prison and disqualified him from driving for at least 12 months until he passes another driving test.