Beecher was promoted from AHL Providence on Friday.
Beecher played in 52 games with Boston during the regular season, scoring seven times while adding three helpers. The 23-year-old, who was selected 30th overall in the 2019 Draft, chipped in with 112 hits and 34 blocked shots in his rookie campaign. He could get into the lineup in a bottom-six role at some point during the playoffs .