If this was over catalytic converters which I would bet it was I'm guessing one or more of these 4 deceased gentlemen had been selling converters to Mr. Kennedy and knew about where they were kept. This wouldn't be anywhere close to the first time thieves went back to rob their receiver (fence) of stolen goods.

Scrap collectors in our neck of the woods are 90+% thieves. My neighbor and I did the leg work for our local sheriff to get a church propane tank and my Honda Recon located at the hideout of some scrap collectors. They were all on probation and now 5 of our finest are in jail for the last 7 months. They are comprised of a 50 year old father and 3 of his young adult illegitimate offspring along with a peripheral family member.

One of them has been arrested 3 times robbing the same scrap yard at a local manufacturing plant.

Patriotism (and religion) is the last refuge of a scoundrel.
Jesus: "Take heed that no man deceive you."
Hebrew Roots Judaizer