Austin Matelson, better known by the ring name Luchasaurus, is an American professional wrestler and television personality. He is currently signed to All Elite Wrestling (AEW), where he performs under the ring name Killswitch, and is a member of The Patriarchy stable. In AEW, he is a former one-time AEW World Tag Team Champion (with Jungle Boy as Jurassic Express) and a former one-time AEW TNT Champion. Matelson began his professional wrestling career in 2009. He then signed a developmental contract with WWE in 2012 and was sent to train at the former Florida Championship Wrestling (FCW) under the ring name Judas Devlin; FCW was then rebranded as NXT that same year where Matelson remained until he was released in 2014. After a two-year hiatus, he signed with Lucha Underground as Vibora and worked there from 2016 to 2018. He also began working on the independent circuit in 2016 under the Luchasaurus gimmick until he signed with AEW in 2019 and took on the ring name Killswitch in 2023. During his two-year wrestling hiatus from 2014 to 2016, Matelson appeared on Access Hollywood and was a house guest on the reality competition, Big Brother 17, in which he placed 5th. He also appeared on The Price Is Right. He later returned for Big Brother 19 in 2017.

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