I was watching an investigation id show last night and it was pretty interesting, forgive me for not remembering the name of the person, my mind is on overdrive. Actually there were two.
In one case a military woman disappeared, her husband (former military) was suspect and there was no evidence. LE believes the guy used his g/f's car to transport the body to PA and threw it in an abandoned mine. They said that there were hundreds of mines and he knew the area like the back of his hand. His brother disclosed that he had asked about getting some dynamite. The theory was that he killed the wife, transported her body, threw it in a mineshaft and blew it up. After 3 days of searching with 100's of military personal, no body was ever found. He was convicted of her murder, no body, all circumstantial evidence.
The second was an employee and his supeervisor, the family ran the business and recevied a ransom note regarding their son's disappearance, against LE advise, they paid the ransom but it was never picked up. The employee was arrested and convicted of the murder. To this day they have not found a body. The most substaintial evidence LE had was a picture of the suspect driving through a toll booth with something to his ear, they believed it was the victims phone, defense said it was a diet Dr. Pepper and wasn't to his ear.
It seems as if circumstantial evidence and absense of a body does not guarantee that nobody will be charged, tried & convicted of murder. Amazingly strange IMO.