Reese started at center in place of Qudus Wahab and became the first true freshman to start a Terps men's basketball game since Donta Scott in 2019.
Maryland Athletics announced a 30-day suspension of Bruce Shingler Wednesday.
Eric Ayala dropped a career-high 26 points with a double-double against the Wildcats.
The Terps fall to 0-3 in conference play after another slow start.
College basketball's leading scorer dropped 35 points after a slow night on defense for the Terps.
All fans in attendance, aged 12 or older, will be required to show proof of vaccination or a negative COVID-19 test from the past 48 hours.
The Terps and the Bears finished with 44 combined fouls and Maryland's starting five combined for 79 of its 81 points.
The Terps played their most complete game of the season, thanks to contributions from the offense, defense and special teams.
The Terps will host the Mountain Hawks while introducing new safety measures following a surge in cases in the region.
Demus chose to forgo the 2022 NFL Draft and will return to the Terps after his senior year was cut short by a knee injury.