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DALLAS -- Jim O'Brien, a head coach for three NBA teams during his career, is retiring after a one-year stint as the Dallas Mavericks' offensive coordinator.
O'Brien, 61, informed Mavs coach Rick Carlisle of his decision on April 16. The Mavs are hiring former Portland Trail Blazers interim coach and assistant Kaleb Canales to replace O'Brien.
"Jim said he loved working in the Mavs organization, but being away from family made his decision easy," Carlisle said via email. "I consider Jim O'Brien a great basketball man of high integrity and thank him for everything he taught me, my staff and our players this past season. We are fortunate that Kaleb Canales became available and had interest in joining the Mavs organization."
O'Brien had a 303-327 record as the coach of the Boston Celtics, Philadelphia 76ers and Indiana Pacers. He had his most success during his stint with the Celtics from 2000 to 2004, leading them to the 2002 Eastern Conference finals and the 2003 conference semifinals.
Canales, 34, is a Texas-Arlington alum who worked his way up the ranks in Portland after being hired as a video intern in 2004. Canales was a finalist for Portland's head coaching position after the Blazers went 8-15 when he filled in following Nate McMillan's firing in 2012. The Blazers hired former Mavs assistant Terry Stotts, and Canales remained in Portland as the defensive coordinator on Stotts' staff.