All we, and the public can do is keep the case alive and active by talking about it.I go there regularly to check if it has been transferred from active to a cold case. TPS likely too embarrassed to actually reclassify it, but the Sherman case certainly appears to be dead. And the killer(s) and their sponsor live life as normal.
I still hold to my opinion, that the TPS know who, why and by whom the killing was done. They are keeping a close eye on the perpetrator(s), and continue to gather evidence so they have a solid case in court.
Bruce McArthur was an example of the TPS knowing who the criminal was and followed him. They only arrested him when it appeared he was going to commit another crime. No rush to arrest because there is no statute of limitations on murder.
Remember, Jack Kay said "follow the money".