Kim Porter – who has three children with the musician – was discovered at her home in LA following a cardiac arrest.
The actress dated Diddy -real name Sean Combs – for 13 years after they first met in 1994.
She had been suffering from pneumonia for several weeks before her death, TMZ reports.
Diddy's rep Cindi Berger told the site: "Sadly, I can confirm the passing of Kim Porter. I ask that you give the families privacy at this time."
Emergency crews were raced to Kim's home at around midday today.
A source said she had contacted her doctor yesterday complaining she wasn't feeling any better after suffering the flu-like symptoms.
Kim split with Diddy for good in 2007 and the pair have three children together – twin girls Jessie James and D'Lila, born in 2006, and son Christian Combs, born in 1998.
She had another child, Quincy, from her previous relationship with AI B.Sure!
Kim was born in Georgia and began her career as a model before moving to Atlanta.
She appeared in TV shows Single Ladies and Wicked Wicked Games as well as movies Mama I Want To Sing and The Brothers.
Kim also featured on Diddy's show I Want to Work for Diddy.
More to follow…
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