|Full name||Sean Thomas Killion|
|National team||United States|
October 24, 1967|
Camden, New Jersey
|Height||6 ft 3 in (1.91 m)|
|Weight||185 lb (84 kg)|
|College team||University of California, Berkeley|
Killion was born in Camden, New Jersey, and spent his early years training at Jersey Wahoos, a club located in Mount Laurel, New Jersey. He claimed the gold medal at the 1991 Pan American Games in the men's 400-meter freestyle event.
Killion represented the United States at the 1992 Summer Olympics in Barcelona, Spain. He competed in the B Final of the men's 400-meter freestyle, and finished with the eleventh-best overall time of 3:52.76. He also recorded a time of 15:27.49 in the preliminary heats of the men's 1,500-meter freestyle, but did not advance.
Killion held the American record in the 800-meter freestyle from July 27, 1987 to August 25, 2002.