An external review into the actions of killer nurse Benjamin Geen could be completed by the end of the month.

Thames Valley Strategic Health Authority has asked independent clinical and management experts to look into how the 25-year-old casualty nurse at the Horton Hospital in Banbury was able to murder two of his patients and cause serious harm to another 15.

Geen, who is serving 17 life sentences and faces at least 30 years in prison, used a range of anaesthetic and muscle relaxant drugs to stop his victims breathing, so he could enjoy saving their lives.

An authority board meeting was being told today that the review could be completed by June 30, and that families of the victims and survivors would be told the findings before they were made public.