Heard was found dead on Friday in his hotel room in Palo Alto, California, according to celebrity news website TMZ.
The Santa Clara medical examiner's office confirmed the death. The cause is unknown.
Heard had reportedly been staying at the hotel after "minor back surgery" this week.
"Our officers responded with the Fire Department to a hotel in our city on a report of a person in need of medical aid," the Palo Alto police department said.