Ku dhammee weedhan soo socota: Deegan wuxuu ku dhashay Camden, New Jersey. Shaqadiisa garsoorka waxay ka bilaabatay horyaalka Midwest League sanadkii 2003. Waxa kale oo uu ka soo shaqeeyay Carolina iyo Koonfurta Horyaalka ka hor inta uusan noqon garsoore horyaalka weyn ee. Horyaalka, wuxuu garsoore ka ahaa afar American League Championship Series: 1970 (Ciyaarta Koowaad oo keliya), 1974, 1977 iyo
1984 kii ayaa la xiray. Wuxuu sidoo kale garsoore ka ahaa ciyaartii All Star ee 1978 iyo Taxanaha Adduunka ee 1976; wuxuu garsoore u ahaa saxanka guriga ee Ciyaarta Afaraad ee Taxanaha, kaas oo horyaalkii difaacayay Cincinnati Reds ku guuleystay xoogga Johnny Bench ee laba-home run, shan-RBI waxqabadka si loo dhammaystiro xoqista New York Yankees. Ciyaartaas, garsooraha koowaad Bruce Froemming ayaa ka saaray maareeyaha Yankees Billy Martin kadib markii Martin uu kubbad ku tuuray Deegan.