The mother of Lin Jun, the Chinese student who was murdered and dismembered, said her "most unbearable pain" is that the killing is still watched online, she told Canada's public broadcaster on Monday.

"What a disaster and huge pain for our family," Du Zhigui said in an interview with the Canadian Broadcasting Corporation, sobbing.

"The most unbearable pain for me is that the video got posted on the Internet. People watched it over and over. It's like my son is being murdered again and again," she said.