Crown lawyers will decide whether to charge Boston's captain for the hit during a regular-season game on March 8 that sidelined Pacioretty with a concussion and a cracked vertebra.
Montreal police said Wednesday that they interviewed Chara last month, after Boston had completed its Stanley Cup-winning run.
Authorities in Quebec got involved amid a public outcry over the NHL's decision to not suspend Chara.
Pacioretty is expected to return to action next season. He was disappointed by the league's failure to discipline Chara, but disagreed with the decision for law enforcement to get involved.