Setting up a hidden camera taking shots every 10 seconds would be a good option. If the shots are high enough resolution you could easily pick up plates and faces for the police to use.
I hate criminals, spawn of this earth. I say hook them to a 2001 16m C kite with no quick release and launch them in 40 knots. Then take video footage so people can finally start showing something other than tophat. Better yet, launch him near an airport so we have some legit footage of someone getting taken out by a plane.
It may not be our job to judge them, but I'm happy to arrange a meeting with his maker and let him judge them.