2009-10: Shea Theodore played in the Aldergrove MHA and was drafted in the third round (64ht overall) of the 2010 WHL Bantam Draft.
2010-11: Theodore appeared in four WHL games with Seattle, spending the bulk of the season with the Fraser Valley Bruins in the British Columbia midget major league, and played for gold medal-winning Team British Columbia in the 2011 Canada Winter Games. He was scoreless and minus-two with 2 penalty minutes in limited ice time with the Thunderbirds. In 35 games for Fraser Valley he scored 5 goals with 24 assists and had 28 penalty minutes. Fraser Valley finished ninth in the 12-team league. In six games at the CWG he had no points and 24 penalty minutes.
2011-12: Theodore was the top-scoring defenseman for Seattle as a 16-year-old in his first WHL season; playing on a Thunderbirds team that missed the playoffs after finishing last in the U.S. DIvision. He scored 4 goals and led all Seattle skaters with 31 assists in 69 games and was minus-36 with 30 penalty minutes.
2012-13: Theodore was among the leading scorers amongst WHL defensemen, finishing with 19 goals and 31 assists in 71 games, and skated for Canada’s gold medal squad at the 2013 U18 World Junior Championship. His minus-24 plus/minus in 71 games for Seattle was an improvement over his rookie season and the Thunderbirds slipped into a playoff spot; finishing one point ahead of last-place Everett in the U.S. Division. In an epic first round series with Kelowna in which five of the seven games went to overtime, Theodore had 2 assists and was plus-one with 4 penalty minutes. He had 5 assists and was plus-five in seven games for Team Canada in Sochi. Theodore was ranked 11th amongst North American skaters in Central Scouting’s final rankings and was selected by Anaheim in the first round (26th overall) in the 2013 NHL Draft.
2013-14: Theodore attended training camp with the Ducks and signed a three-year entry-level contract before being returned to Seattle for his third junior season. He made his pro hockey debut in April — joining Anaheim AHL affiliate Norfolk following the Thunderbirds’ season. He was -2 with no points nor penalties in four regular season games and scored his first career goal with 2 assists in four playoff games. An assistant captain for Seattle, he was the team’s leading scorer with 22 goals with 57 assists and was +19 with 39 penalty minutes in 70 regular season games. The Thunderbirds finished second in the U.S. Division and reached the second round in the playoffs. Theodore had 5 assists and was +1 with 4 penalty minutes in nine playoff games.
Theodore is a high-level offensive defenseman. He specializes in power play situations and is a smooth and agile skater. He has a very accurate and hard shot, and has been a dangerous point man at the junior level. His defensive zone play and physicality could improve but Theodore possesses good intelligence of the game and a very appealing offensive skill set.
Theodore suffered an elbow injury during Anaheim's training camp — eventually joining the WHL's Seattle Thunderbirds for the 2014-15 season in mid-November after a five-game stint with Ducks' AHL affiliate Norfolk. He represented the WHL in the Subway Series against Russia and also won a gold medal with the Canada U20 team at the 2015 World Juniors. Point-per-game defensemen in the Western Hockey League are not uncommon — and that does not guarantee success at the NHL level. Theodore's physical attributes and defensive awareness, though, suggest he can be a top pairing two-way defender who frequently contributes to the attack at that level one day.