A police report says the woman, whose name wasn't immediately released, went to Bosh's home Monday. Bosh has been sidelined with an abdominal strain.
Miami Beach police spokeswoman Vivian Hernandez says the department will conduct its standard death investigation, but there are no immediate signs of foul play.
The woman initially appeared to be well but suddenly collapsed. Fire rescue workers responded and transported the unconscious woman to a nearby hospital, where she died Monday night.
The report says a friend of the victim told officials she had survived cancer about a year ago. The cause of the woman's collapse and eventual death weren't in the report.