Former UFC champion BJ Penn has shared a troubling Instagram video in which he alleges that the government murdered his mother and replaced her with a lookalike impostor.

The 46-year-old former fighter, who previously held titles in both the lightweight and welterweight divisions, made the shocking claim while pointing at a woman he insists is not his real mother.

This lady right here, look at her a** and legs,” Penn says in the video. “She is acting like my 79-year-old mother, but she is not my 79-year-old mother. She’s trying to steal everything and this is not my mother. And I’m putting this out because she’s saying she’s going to get an attorney and try to do something. She’s trying to throw me out and if I attack her, she’ll try to do something, TRO [temporary restraining order] or something else.

Penn also took to social media with a post accusing a man named Paul Abiley—whom he also refers to as Carlos Riveira—of being involved in the alleged conspiracy with government help.