[4][6] In his junior year, after fully recovering, Turner averaged 15.7 points, 12.87 rebounds and 8.64 blocks per game, leading Trinity to a 17–13 record and reaching the state playoffs for the first time in 10 years, and only the ninth time in school history dating back to the school's establishment in 1968.

[2] During the 2013 AAU summer circuit, Turner maintained his high level of production, leading his Texas Select team to the title at the 2013 Jayhawk Invitational in front of coaches from most of the Big 12 schools.

He solidified that by finishing out his high school career with 18.1 points, 12.2 rebounds, 3.5 assists and 6.8 blocks per game, leading the Trojans to a 24–7 record.

[12] On April 30, 2014, live on ESPNU's Recruiting Insider, Turner formally announced his commitment to play basketball for the University of Texas.

[14] He also represented the United States in the 2014 FIBA Americas Under-18 Championship, helping the country win a gold medal.

[16] On March 30, 2015, Turner declared for the NBA draft, forgoing his final three years of college eligibility.

[19] He missed 21 games between November 13 and December 28 of his rookie season after undergoing surgery to repair a fracture in his left thumb.

[24] Turner helped the Pacers reach to the playoffs as the seventh seed in the Eastern Conference with a 45–37 record, where they lost 4–3 to the Toronto Raptors in the first round.

[25]In the Pacers' season opener on October 26, 2016, Turner recorded 30 points and a career-high-tying 16 rebounds in a 130–121 overtime win over the Dallas Mavericks.

[33][34] On October 29, in a 103–93 loss to the Portland Trail Blazers, Turner had three blocks to tie James Edwards (391) for number eight on the franchise's NBA career list.

[43] On October 22, 2021, Turner recorded a career-high 40 points, along with five three-pointers, 10 rebounds, and three blocks in a 134–135 overtime loss to the Washington Wizards.

[44] On November 4, Turner scored 25 points while recording a career-high seven 3-pointers and grabbing 13 rebounds in a 111–98 victory against the New York Knicks.