Before he played in the NHL, Lalonde played 4 seasons in the Ontario Hockey League for the Belleville Bulls. He was drafted by the Blackhawks with the 68th overall pick in the 2008 NHL Entry Draft. He spends most of his time with the Blackhawks AHL farm team, the Rockford IceHogs. He played his first game in the NHL for the Blackhawks on April 14, 2011 in a game against the St. Louis Blues.