Oxford Mail.The actor is best known for his role as DCS Michael Kernan in the ITV show which he played opposite Helen Mirren.John leaves behind his wife of 31 years, Lilian, his son Freddie and his grandson Rex.According to the Daily Mail, John’s agent Markham, Froggatt & Irwin said he always brought a ‘truth and integrity to his roles and was an imposing, strong and rugged figure, with a soul and belief in his craft.’During his time as an actor, the 68-year-old appeared in over 70 TV shows