The cause of her death remains undetermined. An initial investigation found no evidence of any foul play.
Numerous tributes have been offered to Mara in the wake of her death. Manager Craig Dorfman told Variety: "Mary was one of the most beautiful actresses I've ever had the pleasure of meeting.
I can still recall seeing her perform in 1992 on stage in "Mad Forest" on Broadway. She was funny, electric, and an absolute individual. People loved her. She will be missed.
She was slogging through the aftermath of Chemo. Brave, brilliant, Uber-talented. Earth isn't as vibrant without her. R.I.P."
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She shared a collection of photos of her spending time along her favorite river, the St. Lawrence River.