McDyer won his first Donegal Senior Football Championship title with his club in 2005. His free in the 2005 final brought that game to a replay, when he scored 0–3 (including one free).[3][4] 2005 was also the year he first played for his club in the senior championship.[1]
Brian McIver called McDyer into the Donegal senior panel in December 2005, following the 2005 Donegal SFC title win.[3][5] When McIver called him into the senior team, McDyer was 18 years of age.[3] McDyer first played for Donegal at senior inter-county level in 2006.[3] He continued to play inter-county football in 2007.[3]
Towards the end of the 2012 Donegal Senior Football Championship final, McDyer tried to pass the ball back to goalkeeper Stephen McGrath, but his action caused Naomh Conaill to concede a '45. This was converted by St Eunan's player Mark McGowan, and Naomh Conaill lost the game by one point.[3]
McDyer played for his club in the final of the 2015 Donegal Senior Football Championship. His club also won this game, with McDyer scoring 0–2.[9] Then he played for his club in the final of the 2019 Donegal Senior Football Championship. His club won, following a second replay; McDyer started all three games and, though he scored 0–1 in the first game, he was held scoreless in the second and third.[10] Then he made a substitute appearance for his club in the 2020 Donegal Senior Football Championship final. His club won, following extra-time and a penalty shoot-out.[11]
Then McDyer played for his club in the 2022 Donegal SFC final. His club won, with McDyer scoring 0–3,[1][12][13] though at least one source erroneously said 0–2.[14] He was troubled by injury at the time.[1] On 12 December 2022, McDyer was named as the recipient of the annual Gradam Shéamuis Mhic Géidigh.[1][15]RTÉ Raidió na Gaeltachta announced the decision.[16] McDyer was not expecting to be selected.[17] He received the award at an official function in Letterkenny on the evening of 14 December 2022.[18][19] McDyer played for his club in the 2023 Donegal SFC, when his club won the final again, with McDyer scoring 0–1 in that game.[20][21][22]
Personal life
Though originally from Glenties, as of 2022, McDyer was living in Donegal Town.[1] He is not interested in social media.[23]