That's interesting to note. But like you, I believe the girlfriend or her brother to be the most suspicious. It's just a shame that with what evidence that was discovered, authorities still don't have a clear idea as to who is/are responsible. I hope the investigation eventually changes hands and gets some fresh hope before too long.
And thanks for responding! It's always great to get to discuss cases/theories with other true crime writers. See you on the next case! :)