Murphy was ranked as the No. 41 player in the ESPNU 100,[1] the No. 45 player by Rivals.com, and the No. 41 player by Scout.com. He attended St. Mark's School in Southborough, Massachusetts, where he played alongside Kaleb Tarczewski and Nik Stauskas. Murphy led St. Mark's School to a 27–3 record as a junior. Murphy was also named NEPSAC ISL Player of the Year in 2011. In April 2011, he decided to forgo his senior year of high school and join the class of 2011. This allowed Murphy to graduate in the spring of 2011 and attend Duke University in the fall of that year. Murphy left St. Mark's School and attended South Kingstown High School for the remaining months in order to graduate and enroll at Duke that summer.[2]
AAU
Murphy played for the Adidas sponsored New England Playaz Basketball Club.[3]
Murphy committed to play basketball at Duke on February 7, 2011. Recruiting columnists speculated that he would commit to the University of Florida because his older brother, Erik Murphy, was a four-year player under coach Billy Donovan. Murphy chose Duke over Florida, Arizona, Boston College, North Carolina, Villanova and West Virginia.[4]
Reclassification
On April 19, 2011, Murphy announced that he would reclassify and be graduating a year early from St. Mark's School and would enroll at Duke University a year earlier than expected.[5] Having met all academic requirements necessary to do this, Murphy was able to enroll at Duke in the summer of 2011, and was the fifth member of Duke's 2011 recruiting class. "It was a very difficult decision but at the end of the day, I thought this was the best thing for my future," Murphy said. "It's a great opportunity."[5]
College career
Redshirt (2011-2012)
In December 2011, Murphy decided to redshirt his freshman season with fellow recruit Marshall Plumlee. Murphy said, "It's still to be determined, but a redshirt year is most likely what I'm going to do. That's the plan right now." after No. 5 Duke beat Washington, 86–80, at Madison Square Garden.[6]
Professional career
On August 4, 2017, Murphy signed his first professional contract with Joensuun Kataja of the Finnish Korisliiga.[7]
Murphy's father, Jay Murphy, is a former NBA player. His mother, Päivi, from whom he gained a Finnish citizenship by birth, played for the Finland women's national basketball team from 1988 to 1994.[14] His older brother Erik Murphy is also a professional basketball player. The Murphys are Catholic and members of Saint Francis of Assisi Parish in Wakefield, Rhode Island.