The defender will return to his native Ireland, to return to full-time education.
The centre-back originally joined County on loan from Charlton in March 2014, making his debut against Torquay United.
When his contract at Charlton expired in May 2014, Kevin signed a permanent deal with County and went on to make over twenty appearances for the club last campaign.
He featured in the opening game of this season against Cambridge, but sustained a thigh injury in the second half that meant he missed the three games that followed. Kevin returned to action in our home defeat to Leyton Orient and played the entirety of our visit to Plymouth on Saturday.
The club will retain Kevin's registration, as part of the termination agreement.
In light of today's news, Kevin wishes to inform fans that it was a personal decision, indicating a career move away from the game.
"I would just like to thank the football club and the fans, including everybody associated with Newport County AFC for all the support they have given me over the last two years."
"The decision I made was a completely personal one, based on where I wanted to go with my life, at the moment I don't think football is where I want my future to be."
"I just want the fans and the club to know that the decision wasn't based on football, if I was going to continue playing football then it would be for Newport County AFC. I have never enjoyed football as much as I have done during the last two seasons with the club. It is a decision purely based on where I want my life to go."
Newport County AFC would like to wish Kevin all the best for the future and thank him for his efforts during his time with us. Tweets by @NewportCounty