I have always believed it was an intruder. They showed a doc once on a boyfriend of one of the maids. Her boyfriend had been in prison for SO and robbery. He saw JB and got the password from the maid telling her he was going to rob them. instead he raped and killed JB.It was also thought that the maid in order to point suspicion away from herself and the boyfriend wrote the note on paper from inside the house. A PI that JR had hired was thought to have investigated the guy and talked to him and believed he was the one who had killed her. JR then hired someone to kill him. He was found with a handgun in his hand and police called it suicide even though he was left handed. and police know it would be very rare for a handgun to remain in the hand of someone who shoots themselves. JMO
JB wasn't raped. Swabs were taken of her vagina, anus and mouth- NO DNA belonging to anyone was found. No semen. Only her own blood. Helgoth was investigated at the time. Nothing at the crime scene or the house itself linked him to the crime. They had only 1 maid- the housekeeper LHP, who had no link to Helgoth as far as was known.