Her mother Jackie, revealed she is “confident” has “moved on to a better place” after “suffering” with the relentless disease.
Beckie made her debut in the spotlight in 1986, in the first season of Gorgeous Ladies of Wrestling.
Her colleagues are said to be “devastated” by the news of her passing.
The official Twitter account of GLOW shared their condolences with her family.
“RIP to a GLOW Original! It is with a sad heart that we share the passing of Beckie Mullen (Sally The Farmers Daughter) to our GLOW family. She was a spark of energy and will be missed much by her friends and fans,” the statement read.