- Grandson of Irish writer Denis Johnston.
- Nephew of Irish writer Jennifer Johnston.
- Luke passed away unexpectedly, but peacefully at night July 14/15, 2015. He is hugely missed by his large extended family and his many friends and colleagues in the Irish film world, Irish rowing, Fortyfoot swimmers and many more.
- His large extended family and his many friends and colleagues in the Irish film world, Irish rowing, Fortyfoot swimmers and many more have gathered for a celebration of his life held in the Victorian Chapel in Mount Jerome, Harold's Cross on Monday, July 20, 2015.
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