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3 May 2016, 16:27 | Updated: 3 May 2016, 16:50
The trial of a man from Worthing, accused of murder after a minor car crash, has started at Lewes Crown Court.
The jury at Lewes Crown Court has been sworn in and it's already been revealed the trial is not looking at whether Matthew Daley stabbed 79-year-old Don Lock to death, as both sides agree he did kill him.
However the trial will look in to claims the 35-year-old believed he was acting in self-defence, with an argument of diminished responsibility, as he denies the murder charge.
It's been called a 'trial of the experts' as several Psychiatrist and Psychologists will give evidence to determine Daley's metal state at the time of the stabbing.
Witness statements started being read in court on the first day, with one describing him as 'expressionless' during the attack when Matthew Daley stabbed Don Lock multiple times. Another witness was visibly shaken while recalling what happened.
He is being held in a medium-secure unit at the moment.
The trial continues.