Diarmuid Mac an Adhastair (9 December 1943 – 10 July 2015)[1] was an Irish actor who portrayed the character Seamus Mhicil Tom on the Irish drama, Ros na Rún.[2] He appeared from the pilot in 1996 up until the show's nineteenth season. His prior acting was in amateur drama, and he also acted in two short films and a documentary about his life. His pastimes included fishing and wood carving. He listed Pól Ó Foighil and Johnny Chóil Mhaidhc as "People who have influenced me the most".