Boris Nemtsov 'was most outspoken Putin critic'

It is a year since the Russian opposition politician Boris Nemtsov was murdered, just beneath the walls of the Kremlin.

Five Chechen men accused of carrying out the killing for cash - will go on trial later this year.

But despite a pledge by President Putin to ensure this case is solved, Mr Nemtsov's family and friends fear that whoever ordered the killing will not be found.

Zhanna Nemtsova left Russia soon after her father's death fearing for her own safety, but she has vowed to push for the truth - and for justice.

Sarah Rainsford went to meet her.