Katenka Timofey

Katenka Timofey was a girl that trained to be an assassin at the Red Room Academy and was the foster sister of Natasha Romanoff. She died when her foster sister was forced to snap her neck.

The Red Room
Her and Natasha Romanoff's lives were destroyed when Russian separatists rolled into Stalingrad in 1988 and destroyed many of the houses and lives there, including those of the foster family where Katenka and Natasha lives. They were saved by Russian forces that liberated the city, but in turn got the attention of Ilya Fyodor, a mysterious instructor at the Red Room Academy. They enrolled there, having nowhere else to go and were trained and brainwashed into blending into the American and Western societies. After the Sovjet Union collapsed, they were moved to another location to avoid being discovered. As they gradually worked their way to their graduation, one day she and Natasha were sparring and Natasha ultimately got the upper hand and is forced to snap Katenka's neck, after Fyodor threatened to kill the rest of the girls there.