Jayant Patel's defence team has finished calling evidence in the former surgeon's manslaughter trial.
Patel is on trial in the Supreme Court in Brisbane, accused of killing 75-year-old Mervyn Morris.
Mr Morris died of complications including heart and lung failure and septicemia after the former Bundaberg Hospital surgeon removed part of his colon in an attempt to address rectal bleeding in 2003.
Patel took the stand during the trial, insisting his decision to operate was appropriate.
The former surgeon agreed he knew of Mr Morris' frailty and his other medical conditions but said in this case they weren't relevant.
He told the court repeatedly that he believed the surgery was urgent and necessary to prevent further bleeding.
His decision has been backed up by other defence witnesses who have given evidence this week.
However, a number of medical experts called by the Crown have testified they believe Patel misdiagnosed the cause of Mr Morris's bleeding, which they said could have been treated with far less invasive methods.
Lawyers will spend the rest of Thursday in legal argument, before making their closing submissions on Friday.
Justice George Fryberg is then expected to sum up on Monday, after which the jury will retire to consider its verdict.