Expediente X Temporada 4 Episódio 17

While celebrating Scullys 33rd birthday, a strange woman informs Mulder that NICAP member Max Fenig (see Fallen Angel) has recently died in a plane crash. After a visit to the crash site and finding Maxs body with radiation burns on it, Mulder suggests that the plane was intercepted by a UFO and is rapidly being covered up by the military.