2009-10: Dillon Heatherington played for the Calgary Bronks bantam AAA team in Alberta. He scored 8 goals with 16 assists and had 34 penalty minutes in 32 games. Heatherington was selected by Swift Current in the first round (11th overall) of the 2010 WHL Bantam Draft.
2010-11: Heatherington played in his first WHL game as a 15-year-old, dressing for a January game with the Swift Current Broncos, and skated for the Calgary Flames Midget AAA team in the Alberta Midget Hockey League. He had no points or penalties in his appearance with the Broncos. In 31 regular season games for the Flames he had 11 assists and 44 penalty minutes and he had no points with 2 penalty minutes in four playoff games. Heatherington played for Team Alberta in the 2011 Canada Winter Games and had 4 assists with 2 penalty minutes in six games.
2011-12: Heatherington played in 57 games in his first WHL season on a defense group for Swift Current that included NHL draft picks Reece Scarlett (NJ) and Rchard Nedomlel (Det). He scored 2 goals with 8 assists and was plus-2 with 63 penalty minutes. The Broncos missed the playoffs — finishing fifth in the East Division.
2012-13: Heatherington skated in 71 of 72 games for Swift Current in his second season and won a gold medal with Canada’s U18 team at the 2013 World Junior Championship. He scored 4 goals with 23 assists and was plus-25 with 80 penalty minutes. The Broncos reached the WHL playoffs after finishing third in the East Division. Heatherington had 3 assists and was minus-2 in the five game playoff series with Calgary. In seven games at the 2013 U18 WJC in Sochi he scored 1 goal and was plus-2 with 4 penalty minutes. Canada defeated the USA, 3-2, in the gold medal game. Heatherington was ranked 31st amongst North American skaters in the Central Scouting final rankings and was selected by Columbus in the second round (50th overall) in the 2013 NHL Draft.
2013-14: Heatherington attended NHL camp with the Blue Jackets before returning to Swift Current for his third season with the Broncos. Playing in 70 of 72 regular season games, he scored 6 goals with 29 assists and was plus-24 with 63 penalty minutes. Swift Current finished second in the East Division and lost to Medicine Hat in a first round playoff series. Heatherington had 1 assist and was minus-6 with 8 penalty minutes in six playoff games.
2014-15: Heatherington signed a three-year entry-level contract with Columbus in March 2015 — making his pro hockey debut with the AHL’s Springfield Falcons — following his fourth WHL season with Swift Current. In three games with the Falcons he was +1 with 1 assist and had no penalties. Heatherington skated in 48 regular season games for Swift Current, missing time in January and February after suffering an upper body injury. He scored 1 goal with 14 assists and was -16 with 48 penalty minutes. The Broncos finished third in the East Division before being swept by Regina in a first-round series. Heatherington was -3 with no points and 4 penalty minutes in four playoff games. Heatherington skated for the gold medal-winning Canada U20 team at the 2015 World Junior Championship. He was +1 in seven games with no points and 2 penalty minutes.
2015-16: Heatherington skated for the AHL’s Lake Erie Monsters in his first pro season. One of four defensemen for the Monsters to top the 15-point mark, Heatherington saw steady ice time as a 20-year-old. The Monsters were one of four teams to compete for the top spot in the Central Division, reaching the AHL playoffs.
Heatherington is a quality shut down defender that uses his long frame to knock players off of the puck. While his offensive upside is limited, he consistently makes quality breakout passes out of his own zone. He plays a steady defensive game and will rarely be caught out of position. Heatherington is reliable as a penalty killer.
Heatherington stepped into the lineup for Columbus AHL affiliate Lake Erie as a 20-year-old in 2015-16, supplying strong two-way play and contributing offensively in his first season of pro hockey. A big player who skates well, Heatherington fits the prototype of the modern NHL defenseman. He could push for a spot with the Blue Jackets as soon as in 2016-17 but may begin the year in the AHL.