( CNN ) -- A video showing the last moments of a Polish immigrant , who died after Canadian police shot him with a stun gun at Vancouver International Airport , has been made public . This image from video shows an agitated Robert Dziekanski , left , before police used a stun gun on him . Robert Dziekanski , 40 , was traveling to join his mother , who lives in British Columbia , when he ended up spending about 10 hours in the airport 's arrivals area , The Canadian Press said . The video shows Dziekanski , who had never flown before , becoming agitated . It then shows Mounties purportedly shocking Robert Dziekanski with a Taser device after confronting him . Dziekanski did not speak English . The recording was captured by bystander Paul Pritchard on October 14 and was in police hands until he threatened legal action and it was returned to him last week , The Canadian Press reported . Watch as police stun man with Taser » . `` Probably the most disturbing part is one of the officers uses his leg and his knee to pin his neck and his head to the ground , '' Pritchard told CBC News . The dead man 's mother , Zofia Cisowski , told CBC News that Tasers should not be used by police . `` They should do something because that is a killer , a people killer . '' The incident is being investigated by police , Canada 's national police complaints commission and by the coroner , CBC News reported . E-mail to a friend .
Man died after Canadian police arrested him at Montreal Airport on July 14 . Polish immigrant became agitated after being left waiting at airport for 10 hours . Flight was first time he had been on a plane ; he spoke no English . Incident , captured on video by a journalist , is being investigated by police .