Kilgallon, 36, played in York City's youth system before joining Leeds. He has also featured for Sheffield United, Sunderland, Blackburn Rovers and Bradford City.
He has also represented England at Under-18s, 19s, 20s and 21s.
DeGirilamo, 24, re-signs with the club.
Hurst, 28, also joins Gary Hayward's squad ahead of the 2020/21 season.
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