Mallory O’Brien (Allison Smith): Leo McGarry’s daughter (Seasons 1–2, 4–7).Click to see full answer. Considering this, why was Moira Kelly fired from the West Wing?Kelly left the show after the first season after producer Aaron Sorkin decided that her character had played its story out and that Janel Moloney served as a better foil for Bradley Whitford. Her character was not mentioned on the show again, leading to the term Mandyville.Similarly, who played Rena on West Wing? Melissa Marsala played Marina during season 5 of The West Wing. Simply so, did Leo die on West Wing? Spencer has played Leo McGarry, White House Chief of Staff, since The West Wing launched in 1999. McGarry left the job after — and this is creepy — he had a massive heart attack. When the 58-year-old actor died suddenly of a heart attack on Dec. 16, the series was on a planned holiday break.Why did they kill off Mrs Landingham?Viewers of The West Wing may think the death of presidential secretary Dolores Landingham was caused by a drunk driver plowing into her brand-new car. Truth is, she succumbed to a self-inflicted wound unintentionally administered by Kathryn Joosten, who played her, according to West Wing creator Aaron Sorkin.