Robin Williams In Intensive Care

ET has learned new details about the health of actor Robin Williams.

Despite recent reports that Williams is in the intensive care unit at a Florida hospital -- according to the Miami Herald, the actor and comedian is "currently at a Miami hospital with heart issues and could be laid up for a while" -- sources tell ET that the 57-year-old actor is not in intensive care, and is expected to leave the hospital tomorrow.

Earlier this week, Williams canceled four Florida performances of his "Weapons of Self-Destruction" comedy show after he experienced shortness of breath and his doctor advised him to take a week of rest. ET is told that Williams is scheduled to resume his 80-city tour Monday in Jacksonville, and the four performances will be rescheduled.