Mauro Demetrio told the jury he was arrested after an officer told him he could smell cannabis and that he was driving in a suspicious manner. He alleges that once in the van a fat officer sat on him and that an attempt was made to strangle him.
The court heard a doctor found bruise marks around his neck when he examined Mr Demetrio at the police station.
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The 47-year-old man died shortly after 3pm on Tuesday.
Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures reached 29.1C in St James's Park, central London.