Prison inmate Kino Outerbridge definitely took heroin on the morning of his death, a forensic analyst told an inquest — and was killed by the drug within 20 minutes.Forensics expert Desiree Spriggs, a specialist in drug toxicology, said the chemical 6-monoacetylmorphine lingering in Mr Outerbridge’s system could only have been left by heroin.Describing the 37-year-old former addict’s death as “almost instant”, the jury heard from Ms Spriggs that death would have occurred within seven to 20 minutes.Mr Outerbridge was found by prison officers in an unresponsive state, shortly after collapsing a little past 8am on October 6, 2009.The inquest, convened this week in an effort to determine how he died, is expected to come to a conclusion next week.Admitting his addiction upon his arrival at Westgate two months earlier, Mr Outerbridge suffered withdrawal symptoms, but has been described by some inmates as a recovered addict.Magistrate Juan Wolffe asked Ms Spriggs: “If a heroin addict has not used for a period of time, and then they take the amount of the drug they would have taken prior to this lull, it would act as a shock to the system?”She said: “If they slip, and decide to take what they used to, then the body will go into respiratory depression, because it’s no longer used to the amount of the drug.”Ex-inmates have told the inquest they were aware of drug use inside the prison.According to the former occupant of the cell where Mr Outerbridge collapsed, Garrett Burrows, street drugs and home brew were available, but refused to give details on the methods used for smuggling.The jury is to reconvene on May 17.