“Six Feet Under” was the last show to do so, with Frances Conroy and Rachel Griffiths, who lost to Allison Janney (“The West Wing”). For the three years before that, “The Sopranos” stars Edie Falco and Lorraine Bracco competed against each other, with the former winning twice.
The ‘90s yielded co-star nominees in 1997 (“ER’s” Julianna Margulies and Sherry Stringfield) and 1994. But it was ’80s where co-star nominees ruled since there were far fewer shows back then compared to the 500 now. “Cagney & Lacey” (Tyne Daly and Sharon Gless) and “L.A. Law” (Susan Dey and Jill Eikenberry) dominated, but others included “Dallas” (Barbara Bel Geddes and Linda Gray