Karina Menzies, 31, died following the incident in the Ely area of the city on October 19.
The 47-year-old gave his account of what happened to April Jones, but denied her abduction and murder.
Mold Crown Court hears from forensic experts for both the prosecution and defence.
Van driver Matthew Tvrdon has admitted at Cardiff Crown Court that he killed mother-of-three Karina Menzies in a 'hit-and-run' incident in the Welsh capital last October.
He has pleaded guilty to manslaughter on the grounds of diminished responsibility.
The 32-year-old appeared via videolink at Cardiff Crown Court from Ashworth high security psychiatric hospital in Maghull, Merseyside.
Karina Menzies died in the incident in the Ely area of Cardiff on October 19.
A man found guilty of stabbing to death a stranger who called at his Maesteg home has been jailed for 12 years.
Thomas Sutton, 20, died after being stabbed nine times by Stuart Worvell in June last year.
Worvell was convicted of manslaughter in March after a jury found him not guilty of murder.
Cardiff Crown Court had heard Mr Sutton and his friend Kyle Harris, 18, had called at Worvell's house believing to be a party there.
Worvell claimed he had acted in self-defence.
But Judge Mr Justice Wyn Williams KT today told him: "You committed a significant, serious, unlawful attack on Kyle.
"Nothing leads me to believe you have shown any remorse. Certain aspects of your behaviour in court lead me to the opposite conclusion."
A loud explosion can clearly be heard in this video of the Holywell factory fire, submitted by eyewitness Mike Freeman.
Other onlookers reported hearing a 'massive explosion', followed by several more.
North Wales Fire & Rescue Service has confirmed the explosions were from pressurised vessels, and that risk of further explosions has now been minimised.
North Wales Fire & Rescue Service have confirmed explosions heard by Holywell locals were from 'pressurised vessels'.
– North Wales Fire & Rescue Service
A fire originating in external storage is now affecting the building of a factory thought to be producing coat-hangers.
The explosions reported were from pressurised vessels, and risk of further explosions has been minimised.
Firefighters are continuing to fight the fire and smoke is still a problem affecting local residents and local roads. The advice to local residents is still to stay indoors and keep doors and windows shut unless advised otherwise.
The main coast road passing Greenfield Business Park (A548) is still currently closed.