Boston Red Sox The
Boston Red Sox selected Walter in the 26th round, with the 797th overall selection, of the
2019 Major League Baseball draft. After signing with the team, he was assigned to the
Gulf Coast League Red Sox, where he posted a 4–1 record and 2.70 ERA with 39 strikeouts in innings pitched across 13 appearances. Walter did not play in a game in 2020 due to the cancellation of the minor league season because of the
COVID-19 pandemic. Walter began the 2021 season with the
Low-A Salem Red Sox. He was promoted to the
High-A Greenville Drive after posting a 1.45 ERA over 13 appearances. Walter made 25 appearances with 14 starts between the two teams and was named the Red Sox Minor League Pitcher of the Year after having a 2.92 ERA, a 0.97
WHIP, and a .199
batting average against. In June, he was promoted to the
Triple-A Worcester Red Sox. On November 15, 2022, Walter was added to Boston's
40-man roster. Walter was optioned to Triple-A Worcester to begin the 2023 season. Through 13 games (12 starts), Walter struggled to a 6.28 ERA with 64 strikeouts across innings pitched. On June 22, Walter was added to Boston's active roster for the first time. He made his major-league debut that day, pitching innings in relief, allowing three runs. He was then optioned back to Worcester, recalled to Boston on July 4, and returned to Worcester on July 24. He was next recalled to Boston on August 9, and returned to Worcester two days later. Walter picked up his first MLB save on July 8, 2023, pitching 3 innings in a Red Sox victory over Oakland. Walter spent additional time with the Red Sox during September, when major-league rosters expanded to 28 players. Walter was named the winner of the Red Sox'
Lou Gorman Award for 2023, recognizing a player who exhibited perseverance in overcoming obstacles to reach the major leagues. Walter was optioned to Triple-A Worcester prior to the start of the 2024 season. He did not appear for Boston due to a rotator cuff injury, and was
designated for assignment following the acquisition of
Lucas Sims on July 30, 2024. He was released by the Red Sox organization on August 2.
Houston Astros On August 15, 2024, Walter signed a minor league contract with the
Houston Astros. He began the 2025 season with the Triple-A
Sugar Land Space Cowboys, posting a 3-1 record and 1.94 ERA with 41 strikeouts over 10 appearances (six starts). On May 20, 2025, the Astros selected Walter's contract, adding him to their active roster. He made his debut with the
Astros that day, which was also his first major league
start. In that start, Walter tossed five scoreless innings against the
Tampa Bay Rays at
George M. Steinbrenner Field; however, the Rays rallied for 3–2 win and Walter received a
no decision. In nine starts for Houston, he posted a 1-3 record and 3.35 ERA with 52 strikeouts across innings pitched. Walter was placed on the injured list on July 24 with left elbow inflammation, and was transferred to the 60-day injured list on August 22. On September 23, Walter underwent
ulnar collateral ligament reconstruction surgery. ==References==