The Boston Celtics have signed Lonnie Walker IV to an Exhibit 10 contract, as reported by ESPN's Adrian Wojnarowski. This type of contract will allow Walker to earn a bonus if he participates in training camp and plays for the Celtics’ G League affiliate, the Maine Celtics, for at least 60 days. Walker, who averaged 9.7 points and shot 38.4% from three-point range last season with the Brooklyn Nets, joins a Celtics team that has retained most of its championship roster. While Walker is expected to battle for the 15th and final roster spot, his addition provides the Celtics with added scoring depth and three-point shooting off the bench. The move is seen as a low-risk, high-reward signing for Boston, offering Walker a chance to prove himself on a competitive roster.