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.
More top news
A mild day with showers in the west, drier and brighter in the east
A team of experts are calling for people in Wales to take more responsibility over their health. We have a few tips here.
The Football Association of Wales says match fixing is 'quite possibly' the biggest threat to football in Wales.