Proposal: If report crimes was on, the killer gets notoriety. Notoriety flags them as “most wanted” and makes them a mission target. Folks who accept the missions get beacons and tips to the killer’s location. The mission reward is large and paid from the offender’s own funds, with a sizeable portion going to the victims.
This is an opportunity to engage more players, while creating another form of legitimate pvp.
Need to balance to be sure that you can’t just kill your mates and cash in; just make the whole effort costly to the perpetrator.