She was 33 years old.
Freeman's family and manager told TMZ that the singer suffered from a blood clot and bronchitis.
The singer was at home with her husband Dion in Pasadena, Calif., when she reportedly todl him she had trouble breathing.
Dion called 911 and performed CPR until paramedics arrived.
Freeman was pronounced dead at the hospital at 5:30 p.m.
Sources told TMZ that Freeman's blood clot in her lungs.
Freeman, was on Miley Cyrus' team on the NBC ratings juggernaut, placing in the top 11.
She remained close with Cyrus, 26, after her tenure on the series in 2017. Cyrus even paid Freeman's rent for six months when she hit financial trouble.
Freeman previously battled numerous other medical problems, including meningitis, lupus and cervical cancer.
Cyrus posted a tribute to Freeman on Instagram, captioning a photo of a rainbow, "Thank you @janicefreeman ... for everything. This represents you perfectly."