[2][3][4][5] The Boston Red Sox signed Butler as an undrafted free agent after he graduated from Arizona.

Butler batted a combined .241 with 12 home runs and 71 RBIs in 2011, while playing again for Salem, the Portland Sea Dogs of the Class AA Eastern League, and Pawtucket.

In a team-high 72 games behind the plate, he threw out 25 of 82 (30.5 percent) would-be base stealers, led the International League catchers with 54 assists, and was named the PawSox team MVP.

[6] The Red Sox promoted Butler to the major leagues on August 2, due to an injury to David Ross.

[3] Butler's first MLB hit came in his fourth game, on September 10 against the Baltimore Orioles; he went 3-for-4 including two doubles.

[11] On January 14, 2016, Butler signed a minor league deal with the Boston Red Sox with an invitation to spring training.

On August 3, after placing catcher Blake Swihart on the disabled list, the Red Sox added Butler to their major league roster.

[20] Butler's short stint on the Red Sox's active roster during their 2018 World Series run made him eligible for a championship ring.