Liam William Peter Miller, Irish professional footballer, is born on February 13, 1981, in Cork, County Cork.

Miller grows up in Ovens, County Cork, and attends Coachford College in Coachford, County Cork. As a boy, he also plays Gaelic games for his hometown club, Éire Óg, and represents Cork GAA at youth level. His family is his largest influence in football, and Martin O’Neill and Sir Alex Ferguson are also influential to his career.

Miller begins his career with Celtic and is later loaned to the Danish sports club Aarhus Gymnastikforening in 2001. He returns to Celtic Park and breaks into the first-team squad during the 2003–04 season. Rejecting the offer of a new contract from Celtic, he joins Manchester United in 2004 on a free transfer under the Bosman ruling. Loaned to Leeds United during the 2005–06 season, he makes 22 first-team appearances for Manchester United.

Miller represents the Republic of Ireland team internationally, making his debut in 2004 against the Czech Republic. He earns 21 caps over the next five years, scoring one international goal.

From 2006 until 2009, Miller plays for Sunderland, followed by a short stay at Queens Park Rangers from January until May 2009, when he is released. He joins Hibernian in September 2009 on a free transfer. He moves to Australia‘s A-League in 2011 after his contract with Hibernian expires, and represents Perth Glory, Brisbane Roar and Melbourne City there.

On January 15, 2015, he joins League of Ireland Cork City club, choosing his hometown club over several offers in Asia. He makes his debut on March 7 as the season begins with a 1–1 draw at Sligo Rovers. He is a regular in his only season at Turners Cross, in which the team finishes as runners-up in the league and the FAI Cup to Dundalk. On January 19, 2016, he chooses to leave the team.

Miller signs with American third-tier United Soccer League side Wilmington Hammerheads on February 18, 2016. He makes 27 total appearances for the North Carolina-based club, scoring a last-minute equaliser in a 2–2 draw at Orlando City B on July 24.

In 2017, Miller holds an assistant coaching role at Real Monarchs, a USL affiliate of Real Salt Lake. He leaves in November for health reasons.

In November 2017, it is made public that Miller is receiving treatment for pancreatic cancer. He has chemotherapy at the Huntsman Cancer Institute in Salt Lake City before returning to Ireland. He dies in Cork on February 9, 2018, only four days shy of his 37th birthday.

A benefit football match is played on September 25, 2018, with the intention of raising funds for Miller’s family and charities. The Gaelic Athletic Association permits the game to be played at Páirc Uí Chaoimh in Cork, which would not normally be allowed under GAA rules. The match, between a Manchester United XI and a team composed of former Celtic and Republic of Ireland players, ends with the United XI winning on penalties following a 2–2 draw.