The father of a York University student killed last month after a webcam recorded part of the attack said the pain of losing his only child is indescribable.

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Qian Liu, 23, a York University foreign student, was killed while chatting online with her boyfriend last month.

Jianhui Liu's daughter, Qian Liu, a 23-year-old from Beijing, was found dead in her basement apartment — something, he said, that has left "a hole" in his heart.

Qian Liu on an online video chat with her boyfriend, who lives in China, around 1 a.m. ET on April 15 when there was a knock at her door.

She opened the door to a man and a struggle ensued.

Brian Dickson, 29, a former York University student, has been charged with first-degree murder.

Through an interpreter, Jianhui Lui said during a visit to Toronto for his daughter's funeral April 27 that nothing could stop the hurt that he and his wife are feeling.

'Numbers don't matter'

Under China's controversial one-child policy, Liu and his wife cannot have another child. But Liu, a research director with the Communist Party of China, said no number of children could ease the pain.

"Numbers don't matter in this case. As parents, the pain of losing a child is indescribable. If we had more than one child, it wouldn't offer any more comfort. It wouldn't make us feel any less pain because life is life.

"When it is taken away in a flash, it leaves a hole in your heart forever," he said.

Earlier, he said he and his wife had contemplated "joining her," but vowed to be strong to bring their daughter's body back to China, where her 85-year-old grandmother is waiting.

His daughter studied at Beijing City University prior to arriving in Canada in September to further her English studies.

The parents, who had spoken with their daughter about safety before she left Beijing, urged other foreign exchange students and their parents to discuss safety long before they move overseas.

"Don't start preparing just two weeks before they leave; start learning about the city and school earlier than that. It's a long process," Liu said.