In the aftermath of the arrest of the younger Boston bomber and the death of the older one, attention has turned to Katherine Russell, the American wife of Tamerlan Tsarnaev and mother of his 3 year old daughter Zahara.In the aftermath of the arrest of the younger Boston bomber and the death of the older one, attention has turned to Katherine Russell, the American wife of Tamerlan Tsarnaev and mother of his 3 year old daughter Zahara.