A driver who inhaled nitrous oxide from a balloon before and after killing an elderly cyclist at a pedestrian crossing has been detained for more than 11 years.Cain Byrne, 20, ignored a red light and was well over the 50mph limit when he hit Graham Slinn, 81, throwing him at least 15ft in the air.Sheffield Crown Court heard Byrne, who has never held a driving licence, made no attempt to stop at the crossing and could have been travelling at up to 80mph, according to a witness.On Monday he was se

A driver who inhaled nitrous oxide from a balloon before and after killing an elderly cyclist at a pedestrian crossing has been detained for more than 11 years.Cain Byrne, 20, ignored a red light and was well over the 50mph limit when he hit Graham Slinn, 81, throwing him at least 15ft in the air.Sheffield Crown Court heard Byrne, who has never held a driving licence, made no attempt to stop at the crossing and could have been travelling at up to 80mph, according to a witness.On Monday he was sentenced to 11 years and six months' detention in a young offender institution, with an extended licence period of five years. He was banned from driving for 17 years and eight months.Father-of-two Byrne, of Chesterfield, Derbyshire, admitted causing death by dangerous driving and a number of other offences at a previous hearing.An earlier hearing was told Mr Slinn had dismounted and was walking across the A57 near Todwick, South Yorkshire, when he was hit by a Volkswagen Golf driven by Byrne.