▁soap ▁The ▁B old ▁and ▁the ▁Beautiful ▁which ▁deb uted ▁in ▁the ▁spring ▁of ▁ 1 9 8 7 . ▁She ▁port rayed ▁fashion ▁designer ▁Mar go ▁Lyn ley ▁from ▁the ▁serial ' s ▁in ception ▁until ▁ 1 9 9 2 ▁when ▁she ▁left ▁to ▁begin ▁a ▁family . ▁ ▁Through ▁the ▁early ▁ 1 9 9 0 s ▁Kos low ▁bus ied ▁herself ▁with ▁guest - st arring ▁roles ▁in ▁several ▁prime ▁time ▁television ▁series ▁including ▁Sil k ▁St alk ings ▁and ▁The ▁N anny . ▁However , ▁she ▁was ▁l ured ▁back ▁to ▁day time ▁in ▁ 1 9 9 6 ▁in ▁order ▁to ▁replace ▁actress ▁Deb or ah ▁Ada ir ▁who ▁left ▁the ▁N BC ▁soap ▁Days ▁of ▁Our ▁L ives ▁to ▁spend ▁more ▁time ▁with ▁her ▁family . ▁ ▁In ▁the ▁role ▁of ▁v ind ict ive ▁call ▁girl ▁turned ▁corpor ate ▁executive ▁Kate ▁Roberts , ▁Kos low ▁fl our ished ▁on ▁Days ▁of ▁Our ▁L ives ▁quickly ▁becoming ▁a ▁woman ▁fans ▁' lo ve ▁to ▁hate '. ▁The ▁character ▁is ▁known ▁for ▁her ▁w icked ness ▁and ▁de ception , ▁specifically ▁her ▁on going ▁war ▁with ▁fellow ▁S alem ▁resident ▁Sam i ▁Br ady ▁( Al ison ▁S ween ey ), ▁the ▁former ▁ex - f ian cé ▁of ▁Kate ' s ▁son ▁Austin ▁( A ust in ▁Pe ck ) ▁and ▁ex - f ian cé / current ▁ex - w ife ▁of ▁her ▁son ▁Lucas ▁( B ry an ▁D att ilo ), ▁and ▁numerous