Mr Hendy was stabbed in the back and in the neck
A drug addict stabbed a 75-year-old Bristol man because he believed he was part of conspiracy to abuse his children, a court has been told.
Stephen Newton, 42, was suffering from psychosis fuelled by an addiction to amphetamine, the court heard.
Philip Hendy died weeks after the attack outside a newsagent's store in Easton on 29 April 2007.
Mr Newton admits stabbing Mr Hendy but denies his murder. The case at Bristol Crown Court continues.
The court was told Mr Newton believed that there were tunnels under his house from the neighbouring chocolate factory which allowed people to get into his home and abuse his mother.
He also believed that his three children were being sexually abused by the American government which had given his son a sex change to look like Kylie Minogue and that the House of Commons knew about this, the court was told.
Moments after the attack on Mr Hendy, Mr Newton then followed and punched Hargouindbhai Taylor, 84, to the ground as he was walking along the street.
Dr Paul Cantrell, consultant forensic psychiatrist who was in charge of Mr Newton's care at a secure mental health unit after his arrest, told the court that Mr Newton had a long history of mental ill-health.
He said Newton had a personality disorder and that his chronic abuse of high doses of amphetamine-triggered paranoid delusions.
The jury will be asked to consider whether Mr Newton of Carlyle Road, Greenbank, Bristol, was suffering from an abnormality of the mind at the time which diminished his responsibility for the crime.
The case at Bristol Crown Court continues.