Hollywood actress Katherine Heigl is joining the cast of 'Suits' as Meghan Markle and co-star Patrick J. Adams depart. Heigl will join the cast in season 8 playing a new partner at the legal drama's Pearson Specter Litt law firm. Markle and Adams will leave the show at the end of season 7. It was revealed last year that Markle would be leaving the show as Markle prepared for life as a royal — she's set to marry Prince Harry in May, after all.