According to celebrity site TMZ, a dispatch call stated the patient was suffering from cardiac arrest.
According to U.S. reports, the model and actress had been suffering from "flu-like" symptoms for weeks before emergency services were called to her house this week.
"I ask that you give the families privacy at this time", publicist Cindi Berger said. Porter, had three children - 11-year-old twin daughters Jessie James and D'Lila, and son Christian Combs, 20 - with the music mogul. However, the official cause of death is still unknown.
After a few breakups and reconciliations, Porter ended their relationship for good in 2007 amid reports of his infidelity.
That didn't stop stars and some of Porter's famous friends from taking to social media to pay tribute to the mother of four.
Kim Porter, the model and actor who was in a relationship with Diddy for more than 13 years, has died. She appeared on television shows including "Law & Order" and "Wicked Wicked Games", and also had roles in the films "The Brothers" and "Mama, I Want to Sing". "I know Puff is hit up right now", he said, "he loved her for real". "Chin up puff, Positive vibes only", wrote rapper 50 Cent on Twitter.
However, they broke up again - six months after the girls were born - with Porter saying it was her decision at the time.
Diddy was spotted at the house on Thursday afternoon, just before Porter's body was taken away for an autopsy. Porter also had a 27-year-old son, Quincy, from her former marriage to producer Al B. Sure! "We will remain friends and committed parents to our children".