Flight attendants tried to revive the 52-year-old man whose nationality is not known.
"I freaked out," Bryan Redman said. "I got out of there, ran out of there, got into the car, locked the doors."
Norman Barwin ran a clinic in Canada and faces a class action suit.
'Canadian tech companies understand the power of inclusion and diversity of thought, and that talent and skill know no borders,' says a letter signed by more than 200.
Britain's most high-profile Islamist preacher has rejected suggestions he influenced the Ottawa gunman, but warned there could be similar attacks in the UK
Stephen Harper vowed to redouble the country's fight against terrorists abroad after a reported convert to Islam murdered a soldier and rampaged through parliament