White, 97, paid tribute to Engel on Instagram, sharing a photo of the two women laughing as they cuddled up to a large, brown bear.
” ‘Friends Forever’ says it all,” she wrote on Tuesday.
White and Engel starred together on The Mary Tyler Moore Show, The Betty White Show and Hot in Cleveland.
Following the news of Engel’s death, White called her longtime pal “one of the kind and the absolute best,” in a statement to The New York Times.
During a video interview with TV Land in 2012, White said of Engel, “You don’t get a chance very often in your life to meet a friend like Georgia, let alone an actress that you’re working with, and to suddenly find pure gold. That’s a privilege.”
Engel’s talent agent Jackie Stander confirmed to PEOPLE on Monday that the actress died on Friday, April 12. She was 70.
“I am truly saddened to lose a great one of kind friend and client, as so many others she has touched over the years. She was truly an angel and blessed us with love, laughter and grace,” Stander said in a statement to PEOPLE. “Her and her family request prayers in her name from Christian Scientist, Mary Baker Eddy.”
According to The Times, which first reported the news, Engel’s friend and executor John Quilty told the outlet that Engel, a Christian Scientist, didn’t consult doctors and her cause of death is undetermined at this time.
Engel is survived by her sisters Robin Engel and Penny Lusk.