'Impossible and devastating': mother describes the impact of her son's murder

Rozalia Vass, the mother of Tibor Vass, has also made a statement following the sentencing of her son's killer.

The following is a series of extracts:

"On the 11th August I got to know that two innocent 20-year olds, my son Tibor and his friend Alice, were murdered. I got to know that their lives were taken away by Tibor's friend. It was impossible and devastating to believe something like this could happen.

"Previous to that, it was comforting for me to know that Tibor found a good friend in London who was mature, friendly and intelligent.

"His friend promised me personally to look after my son and not let anything happen to him. I trusted him and regarded him as one of my own. That is another reason why the news about my son's murder was so devastating.

"I cannot describe the feeling I have in losing my son in such a tragic way. There are no words to describe the agony and the loss we as a family live with for the rest of our lives."