The defence of the alleged Finsbury Park attacker is due to start at Woolwich Crown Court.
Darren Osborne, 48, denies charges of murder and attempted murder after allegedly ramming a van into Muslim worshippers shortly after midnight on 19 June.
The attack, deemed by prosecutors to be an act of terrorism, killed one man and seriously injured nine others, including a victim who was left trapped under the van.
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On Thursday, the jury heard that a 51-year-old man killed in the attack died of “catastrophic” injuries.
Makram Ali collapsed of unknown causes after leaving Ramadan prayers at the nearby Muslim Welfare House.
He fell to the ground just two minutes before the van struck and killed him shortly after midnight on 19 June, the court heard.
Some of the witnesses who rushed to help the grandfather previously speculated that he may have suffered a heart attack, but a Home Office pathologist said there was no abnormality.
Dr Simon Poole said low blood sugar or muscle weakness could have led to Mr Ali’s collapse but he was alive, talking and moving in the moments before being struck.
“The injuries are best summarised as being catastrophic,” he said. “The heart and lungs ceased to function abruptly... He would have died virtually instantaneously.”
Reports from forensic collision investigators concluded that Mr Osborne “intentionally steered” the van, which he hired in Cardiff and drove to London, into the crowd of worshippers.
Tests found that the vehicle was in good condition and there was nothing in the road that would have caused Mr Osborne to swerve or crash.
The court previously heard the pro-Palestinian al-Quds Day march may have been the father-of-four’s original target but he found surrounding roads closed and started searching for mosques in London.
A statement from Mr Osborne’s partner alleged that the father-of-four became “brainwashed” after watching a drama on grooming gangs and reading far-right social media posts.
Witnesses who saw the defendant in a Cardiff pub the night before the attack heard him allegedly saying: “I’m going to kill Muslims, your family are going to be Muslims, they’re all terrorists and I’m going to take it into my own hands.”
While in the pub, Mr Osborne was seen writing a letter believed to be the same one found in the van after the attack.
Police body-worn camera footage played to the jury earlier this week, showed the defendant launching into expletive-filled rants targeting Muslims, grooming gangs, Sadiq Khan, Jeremy Corbyn, Lily Allen and the Labour Party after he was arrested.
The trial continues.
