Celtics coach Doc Rivers laments losing Ray Allen ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page jim davis/globe staff After five seasons with the Celtics, free agent guard Ray Allen committed on Friday to signing with the Miami Heat. jim davis/globe staff Ray Allen, right, posed with Paul Pierce and Kevin Garnett on July 2007, the year he joined the team. Winslow Townson/associated press The Big Three celebrated winning the NBA title in the 2007-2008 season against the Los Angeles Lakers. Getty Images Ray Allen scored 51 points in an epic performance against the Chicago Bulls in the 2009 playoffs. bill greene/globe staff Allen and the Celtics battled their way into the 2010 NBA Finals, but lost to the Lakers in seven games. jim davis/globe staff After leading the series 3-2, the Celtics lost to LeBron James and the Miami Heat in the 2012 Eastern Conference Finals. Ronald Martinez/Getty Images Ray Allen's departure marks the end of the Big Three era in Boston.