Agent Gennady Markov was a member of S.H.I.E.L.D.
On Yuri Klementiev's yacht, Agent Markov helped Agent Natasha Romanoff get the USB-stick, containing targeting software for the Jericho. After Romanoff obtained the USB-stick, she tried to find Markov and leave the yacht. She found him after he was captured by Sofia, who held a gun against his head. Sofia promised to let him go if Romanoff would give her the USB-stick, which she did. After Sofia gained the USB-stick, she shot Markov in the head and threw him in the water. Romanoff tried to save him, but she was too late.