That trade, which netted the Celts a second-round pick (never conveyed due to its protection) and a trade exception worth $4.3 million dollars (never used as far as I can tell). The deal, about as impactful as Kris was during his time in Boston (like the exception and pick, he was technically useful but practically use-less, logging 8.4 points and 5.9 boards on a 25-win team). This isn't to say Kris wasn't a solid player in his time in green, just that it amounted to very little in the big picture.
Today is also the 41st birthday of former Celtic wing Jamel Thomas, who played for the club for just three days in the 1999-2000 season, averaging 3.7 points, .7 boards, and .7 assists in that short stretch. In fact, Thomas' family is probably a more remarkable connection to the team, as his brother, Sebastian Telfair, played significant minutes for the Celtics in the 2006-07 season, and his cousin, Stephon Marbury, ended his NBA (but not pro) career in Boston. However, if you'd like to read more on Thomas, check TB727's long-form article here.