Tillman attended Pershing High School in Detroit, Michigan, where he averaged 23 points, 16 rebounds, 3 assists and 4.5 blocks during his senior season.

[8] On October 7, 2019, Tillman recorded a double-double of 26 points and 11 rebounds in his debut, shooting 13-of-17 from the field in a 100–73 blowout win over Hapoel Be'er Sheva.

[9] On November 1, 2019, Tillman was named Israeli League Player of the Month after averaging a double-double of 24.3 points and 14.7 rebounds for 31.3 PIR in three games played in October.

[10] On December 1, 2019, Tillman recorded a double-double of 10 rebounds and a season-high 34 points, while shooting 13-of-26 from the field, in a 115–106 double overtime win over Ironi Nes Ziona.

[12] On June 24, 2020, Tillman signed a one-year contract with Dinamo Sassari in the Italian Serie A and FIBA Basketball Champions League.

[21] He made his debut with the team on February 19, 2023, where he put up 12 points, and grabbed 6 rebounds, in a 70–78 loss to Hapoel Galil Elyon.