Margaret Ruth Kidder (October 17, 1948 – May 13, 2018) professionally known as Margot Kidder, was a Cana…Margaret Ruth Kidder (October 17, 1948 – May 13, 2018) professionally known as Margot Kidder, was a Canadian American actress and activist. She rose to fame in 1978 for her role as Lois Lane in the Superman film series, alongside Christopher Reeve. Kidder began her career in the 1960s appearing in low-budget Canadian films and television series, before landing a lead role in Quackser Fortune Has a Cousin in the Bronx (1970).