Debuting professionally in 2021, Henman has only played for the Kraken's minor league affiliates—the Charlotte Checkers, Allen Americans, and the Coachella Valley Firebirds.

Henman was picked in the second round, 21st overall, by the Cape Breton Screaming Eagles in the 2016 Quebec Major Junior Hockey League (QMJHL) draft.

[1] On August 29, he was traded to the Blainville-Boisbriand Armada for forward Tyler Hylland and a fourth-round pick in the 2018 QMJHL draft.

[5] Near the end of January 2018, he was one of 36 QMJHL players listed in the NHL Central Scouting Bureau's Midterm Draft Rankings.

[27] he was named to the Checkers' opening night roster[28] and he made his professional debut with the team on October 17.

[29] Less than two minutes into a November 6 game against the Lehigh Valley Phantoms, Henman scored his first professional goal, in a 7–3 win for the Checkers.

[33] On April 8, 2022, Henman scored a first-period goal in a 3–2 Checkers victory over the Hartford Wolf Pack clinching a spot in the 2021 Calder Cup playoffs.

[38] After the season on June 30, 2024, a day before the start of free agency, the Kraken re-signed Henman to a one-year contract.