judith russell , whose daughter katherine married tamerlan tsarnaev , one of the two mass murderers who set of bombs at the 2013 boston marathon , spoke at a court in the city today .
her words came as jurors decide whether tamerlan 's brother , dzhokhar tsarnaev , 21 , should be put to death after being convicted of a host of crimes in connection with the massacre .
russell was brought before the jury as a defense witness - and told how tamerlan met her daughter and got her pregnant before gradually .