A hospital consultant will stand trial over the manslaughter of a patient.
David Sellu, a colorectal surgeon of Hillingdon in west London, denies killing James Joseph Hughes, 66, at the private Churchill Clementine Hospital in Harrow, north west London, in February 2010.
Mr Hughes travelled from his home in County Armagh, Northern Ireland, for a knee replacement, but collapsed and died a week later after complaining of stomach pains.
It has previously been alleged a tear in his bowel should have been treated before it turned septic and caused his death.
Sellu also pleaded not guilty to perjury, which is alleged to have occurred at Mr Hughes’s inquest.
His trial is due to begin at the Old Bailey on Wednesday.