Daniel Appleton beat 76-year-old Sandy Seagrave to death before killing his wife Amy, 32, outside a house in Crawley Down, West Sussex, on 22 December 2019,
Mr Appleton chased his wife out of their home and attacked her on their driveway. Ms Seagrave, who was passing by, saw what was happening and tried to intervene but Mr Appleton turned his aggression towards the pensioner and killed her with her own walking stick, He also killed his wife, Amy.
Mr Appleton has admitted killing both victims in the attack but denies murdering them because he contests his mental state at the time of the offences.
Nicholas Corsellis QC opened the case on the 16th November. He leads Kerry Broome of counsel.