- Born: 02/20/1985 in Belfast, Northern Ireland
- Birthname: Damian Mackle
- Height & Weight: 6'4", 322 lb
- ICW World Heavyweight Championship
He is a professional wrestler from Northern Ireland, currently signed to WWE, competing in their developmental territory NXT under the ring name Killian Dain. He previously competed on the independent circuit under the ring name Big Damo, which is derived from his original ring name Damian O’Connor.
Prior to joining WWE he was perhaps best known for his work with Insane Championship Wrestling, where he won the ICW World Heavyweight Championship. He also wrestled for numerous promotions on the British independent circuit, around Europe, and in the USA including Progress Wrestling, Revolution Pro Wrestling, Westside Xtreme Wrestling, Absolute Intense Wrestling, Beyond Wrestling, What Culture Pro Wrestling, Premier British Wrestling, Scottish Wrestling Alliance and IPW:UK.
On October 19, 2016, it was announced by WWE that Mackle had signed a developmental contract with the company and had arrived at the WWE Performance Center in Orlando, Florida.
Other Notable Achievements
3CW Tag Team Championship – with Scott Renwick
Pride Wrestling Championship
SWA Laird of the Ring Championship
SWA Tag Team Championship (6 times) – with Scott Renwick (4), Pete O’Neil (1), Micken (1)
W3L Heavyweight Champion
W3L Tag Team Championship – with Scott Renwick
W3L Heavyweight Title Tournament (2011)
XWA British Heavyweight Champion
XWA British Heavyweight Title Tournament (2014)