I have always thought that the murderers of the Clutter family, Perry Smith and Dick Hickock, being in the vicinity of the Walker Murder would have to rank as being one of the BIGGEST coincidences in the history of crime.
While there are a lot of good theories and scenarios on who could have murdered the Walkers and why they were murdered, I have always wondered why Perry and Dick were dismissed so quickly as potential suspects.
These two characters murdered the Clutter family in Nebraska only a short time before, and then they show up in this other area so far from Nebraska where the Walker family is brutally and ruthlessly murdered. Of course they say they didn't do it. But couldn't they be lying - just a little bit?
Others with personal or family connections to the Walkers might have had a more reasonable "motive" for killing them, if you look at crime statistics, or usual murder motives. But Perry and Dick did not really need any motive. They killed the Clutters for essentially no reasons whatever. They state that robbery was their reason for being at the Clutter farm, but that does not rationally lead to the brutal killings which they committed.
In 1967, I saw the movie "In Cold Blood" based on Truman Capote's book by the same very appropriate title. (This was back in the day of movie theater showings, not VHS, DVD, or movie channels on TV.)
Something I remember to this day is that as the movie started, you see Perry Smith (played by actor and later real life murderer Robert Blake) sitting in the back of a bus with his feet propped up on the seat in front of him. At this point some jackass behind me says to his girlfriend, "That's the shoe they trace him with."
It sort of spoiled the plot at the outset. But I wonder if the bloody foot print found at the site of the Walker murder might prove to be the clue which eventually solves this case?