Recording a verdict of unlawful killing the Coroner said:
Within the first minutes of the operation was when Chris was fatally shot. Those two insurgents who were seen leaving the compound, I'm satisifed that one of those was responsible for Chris's death and also Franco's. Chris died from the result of a devastating gunshot wound to the head.
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Andreea Cristea, 29, remains in a critical condition after being rescued from the Thames after a terror attack along Westminster Bridge.
The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.
The man who carried out the Westminster attack is thought to be British born and was once investigated by MI5, the Prime Minister has said.