Apparently the communications are available on liveatc. Apparently, one of the planes was not replying to Tower warnings and directions.
Select CYHU Tower
https://www.liveatc.net/archive.php?m=cyul_app
EDIT: Latest 1 pilot dead, 1 pilot injured, no passengers, and 2 witnesses in shock.
EDIT2: happened at or prior to 12:39 pm local eastern time. 2 C-152.