Anna
The last week had seen everything fall into place just as I had meticulously orchestrated. With the way things were going, it wouldn't be long before I finally got what I wanted. All that I needed to do right now was make sure Luke and Liam kept their noses out of my business. I could have gotten rid of Luke alongside Timothy, but doing that would have easily given me away as the culprit.
Killing Luke was bad in every way possible. Harming him would not only trigger Liam, but could essentially be the end of me. Not only would it attract police attention, Luke's detective friends might actually pick up the case and come after me as well. It was already difficult handling a former detective, having five or ten at my tail would make escape impossible.