What to do and what was done
Okay, as to the slaying of an incapactited being. What is the warlocks aligment? That should be the first concern, then yours, LG, why would you be with such a group if they act like that. No problem with you turning them in. No rumor mongering or false acusations, so you played your alignment.
Now, as to what is expected of you by local npcs. I've never held that adventureres are quasi-police/militia because they aren't, they are mercenaries pure and simple, at best bounty hunters. They acept a monetary award/reward to go kill things. From a RPG perspective, I'd consider making a new PC or as was mentioned talk to the DM about what is going on and what he, if anything, plans to do. Talking to the other players should aslo be done, perhaps before talking to the DM>
Okay, as to the slaying of an incapactited being. What is the warlocks aligment? That should be the first concern, then yours, LG, why would you be with such a group if they act like that. No problem with you turning them in. No rumor mongering or false acusations, so you played your alignment.
Now, as to what is expected of you by local npcs. I've never held that adventureres are quasi-police/militia because they aren't, they are mercenaries pure and simple, at best bounty hunters. They acept a monetary award/reward to go kill things. From a RPG perspective, I'd consider making a new PC or as was mentioned talk to the DM about what is going on and what he, if anything, plans to do. Talking to the other players should aslo be done, perhaps before talking to the DM>