I have had dealings with a few people convicted of homicide offences. The ones who were fairly typical people who killed due to extraordinary circumstances or intolerable stresses were all charged relatively quickly. Those who were convicted on circumstantial evidence were all sociopaths and took a long time to catch and charge. They never admitted anything, even the smallest detail, and never felt any internal pressure to provide details to family members, even anonymously after release from prison decades later. It strikes me that this may well have been a killing which involved sociopathic personalities. It has some of the hall marks.
Food for thought. How do we see the world through the eyes of a sociopath?
"Sociopathic Tendencies Checklist
There are certain attributes that indicate if a person may be showing sociopathic tendencies. The common sociopathic tendencies include the following traits. Just go through the attributes and match the number of 'yes' you find about the behavior of the person you suspect to be a sociopath:
√ Egocentricity
√ Callousness
√ Impulsive nature
√ Lack of conscience
√ Exaggerated sexuality
√ Boasts excessively
√ Takes high risks
√ Finds it very difficult to resist temptation
√ Antagonistic nature. (They show a deprecating attitude toward the opposite sex)
√ They show lack of interest in their partner or lover
√ One may feel used by the person
√ The victims may feel the person does not care for them much
√ Sociopaths tend to take a lot and give back almost nothing in return (This includes physically, materialistically, financially as well as emotionally)
√ Sociopaths love to make others feel sorry for them
√ They love flattery and tend to bask in glory
√ These people tend to make their victims become worried in a very sneaky way
√ They never feel responsible about hurting someone and will instead blame others for their mistakes"
http://www.buzzle.com/articles/sociopathic-tendencies-in-adults.html
I'm not saying that a few sociopathic traits label a person as a murderer. I'm finding it interesting to look at the characters involved to see how they might behave, if they are sociopaths, after being involved in a murder.