RL can be indirectly involved IMO:
If there is the slightest chance RL gave the killer a ride when driving to Lafayette to "purchase tropical fish", and if RL went to Aquarium World, which I understand is one of the places - but not the only one- for aquatics, then I am looking at the Greyhound and the Amtrak Station, which are both in walking distance (app. 2 miles) away from the aquatic store.
Not saying that happened here. The locations just caught my interest, with or without RL involvement. I sure hope they checked the security cams in any way.
RL went to the Carroll County Transfer Station ( South of the bridge) earlier that day and then drives again to Lafayette later in the day to purchase tropical fish. He is not supposed to drive and basically doubles his chances to be routinely stopped. It also doubles the chances, that RL may have seen our B-guy approaching or leaving the area.
All IMO
-Nin