What Is Pneumonia, the Lung Infection that Caused Diane Keaton's Death?

Diane Keaton's Final Days Were Far More Heartbreaking Than Anyone Knew

Diane Keaton was reportedly battling dementia before her passing, according to several media outlets.

Diane Keaton's Heartbreaking Fight: Hollywood Icon 'Secretly Battled Cancer' Before Pneumonia Death at 79 — 'She Never Wanted Anyone's Pity'

The Oscar winner died on October 11, and her family confirmed she was cremated just a few days later.

What is pneumonia, the lung infection that caused Diane Keaton's death?

While it wasn't clear whether Keaton had any underlying conditions, doctors say "perfectly healthy" people can die from pneumonia.

Exclusive: Diane Keaton Spent Her Last Months at Palm Springs Retreat "So Exclusive People Barely Know It Exists"

Of all celebrity deaths — Robert Redford, Gene Hackman — just one has hit us like a depth charge. A week ago, Diane Keaton, beloved actress and many other things, left us at 79 years old. She was an absolute delight. For a celebrity never to have a bad word said about them is a […] The post Exclusive: Diane Keaton Spent Her Last Months at Palm Springs Retreat “So Exclusive People Barely Know It Exists” appeared first on Showbiz411.

Elizabeth Berkley Recalls Working with ‘Hero’ Diane Keaton on 'First Wives Club,' Reveals What Late Actress Taught Her

Berkley looks back on her time working with Keaton on 'The First Wives Club' following the beloved actress' deathParamount/Getty; Paramount/Kobal/Shutterstock Elizabeth Berkley (left) and Diane Keaton (right) in 'First Wives Club.'NEED TO KNOWElizabeth Berkley, 53, caught up with PEOPLE at the world premiere of Hulu's upcoming series, All's Fair, on Oct. 16 at the DGA Theater in West Hollywood, Calif. Berkley opened up about what it was like wor…