After going undrafted in the 2015 NBA draft, Trice joined the Miami Heat for 2015 NBA Summer League. On September 22, 2015, he signed with the New York Knicks. However, he was later waived by the Knicks on October 23 after appearing in two preseason games. On November 2, 2015, he was acquired by the Westchester Knicks of the NBA Development League as an affiliate player of New York. In 51 games for Westchester in 2015–16, he averaged 15.3 points, 3.5 rebounds, 5.7 assists and 1.4 steals per game.