Lord Justice Scott Baker, summing up the six-month probe for jurors for a second day, said it was "blindingly obvious" that butler Paul Burrell - who was more concerned with exploiting his connection to Diana - "hadn't told the truth, the whole truth and nothing but the truth" during three days of testimony.
Baker also said there was strong evidence that James Andanson, a paparazzi photographer who claimed he had been in Paris trailing Diana the night of the crash, had lied about his whereabouts that night. Andanson has since died.
Jurors are expected to get the case Wednesday, according to CBS News correspondent Sheila MacVicar.
On Monday, Baker said there is no evidence that Prince Philip, the Secret Intelligence Service or any other government agency had anything to do with her death in a 1997 car crash.
Baker told jurors they had the option of deciding that Diana and her boyfriend Dodi Fayed died as the result of an accident or as the result of gross negligence by the paparazzi following their car or of drunk driving by Henri Paul, MacVicar says.
Diana, Fayed and driver Henri Paul died in a Paris car accident in 1997 while trailed by photographers - a crash Fayed's father, Mohamed Al Fayed, claims was part of a plot directed by Queen Elizabeth II's husband, Prince Philip, and carried out by British secret agents.
Fayed had accused Andanson of being a secret agent who helped set up the accident.
Andanson apparently became identified as a suspect because he was a paparazzi photographer and owned a white Fiat Uno - the same type of car that sideswiped the Mercedes carrying Diana and Fayed in or near the Alma tunnel before their fatal crash.
French police were never able to locate the white Fiat.
Baker said Tuesday that Burrell's testimony appeared to be based in part on prospects for exploiting his connection with the princess. Burrell testified that some three months after the crash, the queen warned him to be careful because there were unidentified forces at work in the country.
Burrell said he thought the queen's meaning was unclear, but took it simply as a friendly warning.
Upon returning to the United States after his testimony, Burrell was captured on camera boasting that he hadn't told whole truth and planted some red herrings in his testimony. He refused to return to explain himself to the inquest.
"All in all, you may think Burrell behaved pretty shabby," Baker said. "But beyond the extent to which it reflects on his honesty on whether other matters are true, you may think it has no impact on the means by which these people came to their deaths."