According to Paul Coro of Arizona Central, Shawn Marion will retire from the NBA after this season, his 15th in the league. Marion has been one of the most unique players in the NBA for some time, possessing a wide-ranging and unorthodox skill set.
Marion has made the All-Star game four times as a Phoenix Sun, and won an NBA championship in 2011 with the Dallas Mavericks. He has played multiple positions throughout his career, and is an excellent rebounder for his size. There is a good chance he finishes in the top 20 all-time in defensive rebounds.
For the Cavaliers, this could represent a big blow. Marion is fifth in the team in total minutes, and has started much of the season at shooting guard. Brought on as an ideal backup for LeBron James who could also bring versatility as a small-ball power forward, the inconsistency of Dion Waiters and Matthew Dellavedova pushed him into a different role. WIth Iman Shumpert nearing a return, the Cavaliers are presumably hoping they've found a long term option at shooting guard. Marion, at 36, is far from what he once was but provides a base level of competence. David Griffin will likely have limited resources to boost the team's depth this summer. This won't help.
So far this season Marion has provided competent defense and rebounding while shooting 42/29/80 and averaging 5.6 points and 4 rebounds in 23 minutes of action a night.