As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE EMERGENCY EXIT WINDOW, WHICH IS THE PILOT'S SIDE WINDOW, DEPARTED THE AIRCRAFT IN CRUISE FLIGHT AT 4,500 FEET. THE WINDOW DID NOT STRIKE ANY AIRCRAFT STRUCTURE OR CONTROL SURFACE. THE AIRCRAFT FLEW NORMALLY AND THE PILOT DID NOT EXPERIENCE ANY OTHER DIFFICULTIES. THE ACFT LANDED WITHOUT INCIDENT AND THERE WERE NO INJURIES TO THE 2 PERSONNEL ON BOARD.