[4] After completing his missionary service, Chatman attended Brigham Young University and took a redshirt as a true freshman in the 2014–15 season to recover from an injury.

As a redshirt freshman, Chatman averaged 2.6 points and 1.0 rebounds per game, shooting 18-of-53 from long range and helping BYU compile a 26–11 record and reach the NIT semifinals.

[8] His best game came on January 29, 2017 against the Virginia Tech Hokies, scoring 30 points and made nine consecutive threes pointers, which set an Atlantic Coast Conference record.

[10] On December 9, 2017, Chatman scored 22 points and helped the Boston College Eagles beat the previously undefeated and #1 nationally ranked Duke.

[18] For his rookie season in 2019–20, Chatman signed with CSU Sibiu, a professional basketball team in Romania that competed in both the Liga Națională and FIBA Europe Cup.

[19] His best game in the Liga Națională was on February 1, 2020 when he scored 31 points in a victory vs Romanian powerhouse CS Universitatea Cluj-Napoca (men's basketball).

[23] Chatman served as a missionary for the Church of Jesus Christ of Latter-day Saints for two years (2012–2014) in Taipei, Taiwan where he learned to speak Mandarin Chinese.