Ireland, and he went on to feature in '71 in 2014 and Mammal and Trespass Against Us in 2016. Keoghan appeared in two films in 2017. He featured as George Mills in Dunkirk and starred as Martin Lang in The Killing of a Sacred Deer alongside Colin Farrell and Nicole Kidman. He won the Irish Film and Television Award for Best Supporting Actor for his work in The Killing of a Sacred Deer. The following year, he appeared in Black '47 as Hobson, an English soldier stationed in Ireland during the Great Famine. He also starred in American Animals the same year. He portrayed Spencer Reinhart in the film, based on a real-life theft of rare books from a university library. In 2018, The Hollywood Reporter described Keoghan as "the next big thing" for his film work in the previous three years and in 2019 he was nominated for the BAFTA Rising Star Award. He appeared in the 2019 mini-series Chernobyl. He starred in an episode of Living With Lucy in September 2019. That same month, Calm With Horses premiered at the Toronto International Film Festival. In July 2018, Keoghan was cast as lead character Yorick Brown in the pilot of Y: The Last Man but exited the main series production in February 2020. Keoghan played Druig in the Marvel Cinematic Universe film Eternals in November 2021. He also appeared in The Green Knight. Keoghan appeared in Matt Reeves' film The Batman (2022) credited as "Unseen Arkham Prisoner" and Reeves later confirmed that Keoghan was the Joker. On 24 March 2022, three weeks after the film's release, Warner Bros. released a deleted scene featuring Keoghan's Joker and Robert Pattinson's Batman. Keoghan received an Academy Award for Best Supporting Actor nomination, and won BAFTA Award for Best Actor in a Supporting Role for his performance in the 2022 film The Banshees of Inisherin. Personal life Keoghan is an amateur boxer. From 2017 to 2020 Keoghan was in a relationship with Killarney native Shona Guerin, whom he had met on Good Friday in a Killarney pub in which she was working. The pair appeared on Livin' with Lucy together in 2019 in which Lucy Kennedy stayed with them in their Los Angeles home. In September 2021 Keoghan began dating Alyson Kierans, a dentist whose father is from County Cavan. A few months later, on Ireland's Mother's Day, 27 March 2022, he announced