According to the video, the politician was gunned down at 23:31 Moscow time by a killer who was allegedly waiting for him on the stairs of the bridge.
The murder happened when Nemtsov and his companion – a woman in a white coat, allegedly Ukrainian model Anna Duritskaya – were covered from the camera by a snow-clearing vehicle passing by.
The alleged killer then ran towards a car which was stopped on the bridge several meters away. He got into the passenger's seat, and the vehicle drove off.
LifeNews also obtained footage showing Nemtsov and Duritskaya arriving separately at GUM department store facing Red Square at around 22:00 MSK.
The pair apparently had dinner at one of GUM’s restaurants and then decided to walk to the politician’s nearby apartment – the path of which required a walk across Bolshoy Moskvoretsky Bridge.
UK, France, Germany Ambassadors to Russia walking together to lay flowers at spot of Nemtsov's murder.
Moscow city authorities meanwhile have given permission to Russian opposition leaders to hold a march to commemorate Nemtsov after they canceled a planned protest rally due to the murder. The Sunday rally will cross the Bolshoy Moskvoretsky Bridge where the politician was shot dead.
“There is no doubt that this crime was carefully planned. The location and timing of the killing indicated that as well. The investigation found out that Boris Nemtsov was going with his female friend to his apartment, which is located close to the murder scene. The organizers and the executers apparently knew his route,” Vladimir Markin, spokesman for the Investigative Committee, told journalists.