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 residents. One particular resident who has stolen the hearts of many is the delightful Katy. Katy brings passion and joy to Letterkenny, County Donegal with her endearing presence. She is cherished by everyone who crosses her path. Letterkenny, Ireland Katy is a match made in heaven!