Hains' mother, Jane Badler, said he struggled with mental illness and addiction and that she will "miss Harry every day of my life."
Harry Hains, an Australian actor best known for appearing in "American Horror Story" and "The OA" died Tuesday in Los Angeles.
He was 27.
"Sadly he struggled with mental illness and addiction," his mother, Jane Badler, wrote in an Instagram post confirming his death. "A brilliant spark shone bright too short a time."
Hains had previously spoken about being gender fluid, telling the magazine Boys By Girls that he didn't think he represented "what it means to be a man."
"I believe we should be whatever we want," Hains said. "It gets kind of confusing when we start labeling ourselves, so I try to stay away from labels.”
He also starred in the 2015 drama "The Surface," and worked as a model and performed as a musician under the name Antiboy.
Badler announced that a memorial service for Hains will take place Sunday in Los Angeles.