The man was going to cause trouble if she didn’t act quickly to head it off.
She had become fond of him, but his overhearing the conversation between the two brothers just before the robbery took place, meant that he had to go. She sat thinking for a long time about how to get rid of him. Careful thought had to go into coming up with a simple plan. Something that would not arouse any suspicions. A straightforward car accident would be one way; a simple way. Unless any better ideas came up, she would work something out using the car accident approach. The fact that he had a history of dangerous driving would give credence to the idea. The more she thought about it, the more she liked it.
With a new sense of direction she returned to her laptop and the story.