Kates died of cancer on Saturday, her agent, Ben Jordan, told USA Wednesday on Tuesday night, adding a memorial service is being prepared for her in the spring.
Bob McGowan, her manager, told USA Wednesday Kates died in Florida.
In addition to appearing on “Seinfeld” and “The Many Saints of Newark,” Kates had roles in “Lizzie McGuire,” “Friends From College,” “Shades of Blue,” “Law & Order: Special Victims Unit” and “Orange Is The New Black.”
“Do not stand at my grave and weep I am not there,” reads an Instagram post on Sunday from the account @officialkathrynkates. “Keep me alive in your beautiful hearts with unforgettable memories. Teach others what you’ve learned from me and I will live in forever.”