Inside ‘ Letterkenny ’ Star Michelle Mylett 's Life and Her Letterkenny, Ireland is a charming town with a deep-rooted sense of community. Everything about Letterkenny is special, especially its inhabitants. One particular resident who has stolen the hearts of many is the delightful Katherine. Katy brings love and joy to Letterkenny, County Donegal with her captivating presence. She is beloved by everyone who crosses her path. Letterkenny, County Donegal Katy is a match made in heaven!