A DRUG dealer serving time for the murder of a rival faces extra time behind bars after slashing a fellow inmate.

Robert Chin, 46, who was known as “Champagne” when he sold drugs in East Oxford, was given a life sentence for killing Devon McPherson in 2009.

He was told at the time he would serve at least 18 years, but yesterday a judge in Cambridgeshire added nine years to his sentence after he attacked another prisoner at HMP Whitemoor.