Dublin Murders Guest cast, played by Niall O'Brien Episode 1x03: Episode 3 (Oct 21, 2019) Episode 1x04: Episode 4 (Oct 22, 2019) Episode 1x05: Episode 5 (Oct 28, 2019) Episode 1x07: Episode 7 (Nov 4, 2019) Episode 1x08: Episode 8 (Nov 5, 2019)