Drafted in the second round (33rd overall) of the 2013 NHL Entry Draft by the Lightning, Erne has totaled 27 points (13-14-27) in 114 games over the last three seasons with Tampa Bay, in addition to suiting up in three playoff games for the Lightning last season. The 6-foot-1, 214-pound forward has spent parts of four seasons (2013-18) with the Syracuse Crunch of the American Hockey League, skating in 150 games and recording 41 goals and 47 assists. Erne also posted 10 points (3-7-10) for the Crunch during their postseason run in 2016-17 before being defeated by the Grand Rapids Griffins in the Calder Cup Finals.
Prior to turning pro, Erne suited up for the Quebec Remparts of the Quebec Major Junior Hockey League for four seasons, totaling 118 goals, 157 assists and 275 points in 240 games. During his final campaign in Quebec (2014-15), Erne posted a career-best 86 points (41-45-86) in 60 games and led the Remparts to a President Cup victory, tallying 21 goals and nine assists during the team's playoff run and claiming the Guy Lafleur Trophy as the postseason most valuable player. Before joining the Remparts, Erne skated with the Indiana Ice of the USHL for one season (2010-11), recording 18 points (10-8-18) in 45 games. A native of New Haven, Conn., Erne represented Team USA at the 2012 Ivan Hlinka Memorial Tournament in Breclav, Czech Republic and Piestany, Slovakia and the 2014 IIHF World Junior Championship in Malmo, Sweden.