Beasley had a standout freshman season at Florida State, earning freshman-team All-Atlantic Coast Conference (ACC) honors[4] after averaging 15.6 points and 5.3 rebounds per game.

Beasley saw limited minutes off the bench his first two seasons but took on a larger role in his third year, averaging over 11 points in 81 games played.

[7] He attended high school with Kobi Simmons, Kaiser Gates, and Jacob Davis (Birmingham–Southern College football player).

Regarded as a four-star recruit by Rivals.com,[8] Beasley committed to Florida State over offers from UConn, UCLA, Wake Forest, Oregon, and others.

[26] On March 5, 2022, Beasley broke the Timberwolves franchise record for most three-pointers made in a single season, surpassing Kevin Love's 190.

[31] On October 19, Beasley made his Jazz debut, logging 15 points and five rebounds in a 123–102 win over the Denver Nuggets.

[34] On June 29, 2023, the Los Angeles Lakers declined Beasley's team option, making him a free agent.

[37] On February 17, 2024, Beasley participated in the Three-Point Contest during the NBA's all-star weekend, ultimately losing to his Bucks teammate Damian Lillard.

[41] His grandfather was actor John Beasley, who played the role of Notre Dame football Coach Warren, welcoming new walk-on players to fall practice, in the film Rudy.

[44] On September 27, 2020, Beasley was arrested for marijuana possession, concealing stolen property, and for an incident in which he brandished a firearm.

[45] He was initially released from law enforcement custody but later faced charges in Hennepin County stemming from the incident.

[46] Beasley pled guilty to the felony charge of making a threat of violence in December 2020 and was sentenced to serve 120 days in jail, with confinement occurring after the conclusion of the 2020–21 NBA season.