About Killian Dain
Damian Mackle (born 20 February 1985) is an Irish professional wrestler. He performs on the independent circuit under the ring name Big Damo (shortened from his initial ring name Damian O'Connor). He is also the co-owner of the independent promotions DEFY Wrestling and Progress Wrestling. He is best known for his time in WWE, where he performed under the ring name Killian Dain. Prior to joining WWE, Mackle won the ICW World Heavyweight Championship while wrestling for Insane Championship Wrestling. He also wrestled for numerous promotions on the British independent circuit, around Europe, and in the USA including All Elite Wrestling, Progress Wrestling, Revolution Pro Wrestling, Westside Xtreme Wrestling, Absolute Intense Wrestling, Beyond Wrestling, Premier British Wrestling, Scottish Wrestling Alliance, What Culture Pro Wrestling and IPW:UK. On 19 October 2016, WWE announced that Mackle had signed a developmental contract with the company and had arrived at the WWE Performance Center in Orlando, Florida. He began to work in the NXT brand as part of the stable Sanity, along with Nikki Cross, Eric Young and Alexander Wolfe. In 2018, Dain, Wolfe and Young were drafted to SmackDown, where they worked as a stable until the dissolution. Then, he was drafted again to NXT, where he stayed until his release, in June 2021. On the 25 January episode of NXT, Dain appeared as part of SAnitY for the first time, attacking Chris Atkins by Young's order. On the 19 July episode of NXT, Dain lost to Drew McIntyre in an NXT Championship No. 1 Contender's match, marking his first televised loss.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.