"I bet they came here to kill Lisa."

Police, who broke into the flat when alerted by Stuart's parents, believe he killed Lisa because she planned to leave him.

"And if I don't go, he's going to kill Lisa."

Because you want to know who killed Lisa.

Finally, he gains the courage to kill Lisa, but it is not premeditated or planned like the others.

He spent all his time trying to trip me up instead of looking for the person who actually killed Lisa.

They know that the one that killed Lisa came from a different gun.

Ultimately, the rest of Ianto's team is forced to kill Lisa.

There was no way a person in her condition could strike this tremendous blow that killed Lisa.

Anthony kills the ship's first mate and wrote a suicide note, stating that she was the one who killed Lisa.