(CNN) Doris Roberts, who played the nosy and overbearing mother to Ray Romano's character on the sitcom "Everybody Loves Raymond," has died, the show's former spokeswoman said Monday. Roberts played Marie Barone, who was a constant thorn in the side of her daughter-in-law, played by Patricia Heaton. "Truly the end of an era," Heaton wrote in a statement she posted on Twitter. "My wonderful TV mother-in-law and ("Everybody Loves Raymond") nemesis Doris Roberts was a consummate professional from whom I learned so much.