A hospital employee has been fired from his job after authorities say he used a pen with a hidden camera to record his colleagues in a staff-only restroom.A Lahey Health spokesman said the pen was found by staff at the Lahey Hospital & Medical Center in Burlington last week during a routine cleaning of an employee restroom.Burlington police said Michael Mcdermott, 21, of Tewksbury is being charged with possession of a wiretap device and three counts of photographing an unsuspected nude person.