The "Dick Van Dyke Show" creator and "Oh, God!" director had a show business career that lasted decades.
"She is alive in my heart," the CNN anchor wrote of his mother, who died last year at age 95.
Fellow writers on the NBC series said Waters, who also worked on "Kidding," was a "brilliant storyteller."
"I truly envied him as a performer," ex-bandmate Jesse McCartney wrote.
"We struggled with what else we could have done to save him," the "Come To My Window" singer wrote on Instagram.
Ross, a.k.a. Miss Minnie, said she participated in the Lifetime reality series to illuminate the struggles of little people.
The Martha's Vineyard community theater fixture was "tickled" by her brush with fame, a friend said.
Maggie Griffin, who often appeared on Griffin's "My Life on the D-List" reality show, had dementia.
He played Sam Camden for years on the WB series.
Waligwa was praised as a "sweet, warm, talented girl" by co-star Lupita Nyong'o.