Speaking to Variety, Ms Chapman said that she was 'devastated' by the mistake.
"I was devastated by the use of my image in place of my great friend and long-time collaborator Janet Patterson. I had urged her agency to check any photograph which might be used and understand that they were told that the Academy had it covered. Janet was a great beauty and four-time Oscar nominee and it is very disappointing that the error was not picked up. I am alive and well and an active producer," said Ms Chapman in an email to Variety.
Twitter lost no time in reminding the Academy that it had messed up:
Pic of my pal Jan Chapman- very much alive - was just featured in In Memoriam. #Oscars? Virginia M Moncrieff (@VMMoncrieff) February 27, 2017
#oscars also botched the 'in memoriam' showing a pic of the very much still alive Jan Chapman instead of the late Janet Patterson. I can't.? Ms Gambling (@MsGambling) February 27, 2017
THAT'S NOT JANET PATTERSON! #OSCARS Jan Chapman is ok? Fiona Williams (@anythingbutfifi) February 27, 2017
The Academy has yet to comment on the mistake.
The In Memoriam segment this year, presented by Jennifer Aniston, also honoured veteran actor Om Puri. Mr Puri, who acted in several critically-acclaimed movies, died on January 6 at the age of 66. The segment remembered Carrie Fisher, Prince and other members of the film fraternity whom the industry lost this last year. In her introduction, Ms Aniston paid tribute to actor Bill Paxton who died a day before the Oscars and wasn't included in the video. The montage was played to a live performance by singer Sara Bareilles.