▁prost itute ▁who ▁helps ▁Grace ▁out ▁with ▁tips ▁on ▁investig ations . ▁Al vin ▁Green ▁( Ste ve ▁Rank in ): ▁A ▁cattle ▁baron ▁who ▁is ▁used ▁to ▁getting ▁what ▁he ▁wants , ▁Al vin ▁Green ▁p aws ▁Grace ▁while ▁she ' s ▁on ▁the ▁job . ▁ ▁He ▁wind s ▁up ▁with ▁a ▁face ▁full ▁of ▁kn uck les ▁and ▁flat ▁on ▁his ▁back ▁for ▁his ▁trouble . ▁ ▁Brad ▁G hol ston ▁( Ste ven ▁C ulp ): ▁Brad ▁G hol ston ▁is ▁a ▁detect ive ▁in ▁the ▁In ternal ▁Affairs ▁division . ▁ ▁Once ▁upon ▁a ▁time ▁Brad ▁worked ▁the ▁streets ▁with ▁Grace , ▁but ▁he ▁wasn ' t ▁cut ▁out ▁for ▁it . ▁ ▁He ▁and ▁Grace ▁now ▁have ▁a ▁very ▁t ense ▁relationship . ▁Abb y ▁Charles ▁( Christ ina ▁Ric ci ): ▁Abb y ▁works ▁a ▁rotation ▁as ▁Grace ' s ▁partner ▁under ▁the ▁gu ise ▁of ▁a ▁young ▁pat rol ▁officer . ▁ ▁Later ▁the ▁squad ▁found ▁out ▁that ▁she ▁was ▁with ▁internal ▁affairs , ▁sent ▁by ▁Brad ▁G hol ston ▁to ▁dig ▁up ▁d irt . ▁Mag gie ▁( K ath y ▁Baker ): ▁Mag gie ▁showed ▁up ▁as ▁the ▁new ▁love ▁of ▁Doug ▁Norman ' s ▁life , ▁until ▁it ▁was ▁found ▁out ▁that ▁she ▁was ▁a ▁criminal ▁wanting ▁to ▁c ash ▁in ▁on ▁the ▁triple ▁life ▁ins urance ▁Doug ▁took ▁out ▁after ▁Mary ▁Frances ' ▁death . ▁Father ▁Patrick ▁Mur phy ▁( R en é ▁A uber j ono is ): ▁The ▁family