They has always demonstrated the ability to incapacitate two grown adults, which I don't think a novice to serial murder would typically be able to do.Okay, let's get to today's story. If the cases are connected, I wouldn't be surprised if the perpetrator has killed prior and after this series. ![]() I think it's possible the card itself is irrelevant to the case, and could have been given to Diana at anytime, not necessarily on the day she was murdered. I always wondered if the perp(s) decided to set Mike up so they could leave the area and continue to kill, with the hope the crimes would be connected to Mike. Who wrote the note in Diana's truck? Was this an act to try and frame Mike? I doubt the perp(s) know the couples personally either, but I can't speculate if the crimes were pre-planned or works of opportunity. The combination of strangulation/use of a knife on the female, and firearm to incapacitate the male tells me the cases are connected - MO wise at least. I'm not sure how common it is for a tube sock to be used as a ligature, but on top of the strangulation, Cooper had nearly been decapitated and Robertson was stabbed 17 times. I believe LE stated the cases are related, and have DNA. It's really up in the air.Īre the cases related? Did the perpetrator(s) know the two couples personally or is this a local who preys on campers? She was too young to make a positive identification of the perpetrator, and maybe the perpetrator didn't feel comfortable killing children. As for why, no one can really say for sure. There was a lot of speculation about this in a previous thread. ![]() There's no way a child would've made it out of those woods alone, alive at least - let alone to a densely populated area. Who wrote the note in Diana's truck? Was this an act to try and frame Mike?ĭid the person who murdered Diana and Mike drive Crystal 30 miles away to Spanaway? Why? Are the cases related? Did the perpetrator(s) know the two couples personally or is this a local who preys on campers? Did the person who murdered Diana and Mike drive Crystal 30 miles away to Spanaway? Why? Diana and Mike were found near Mineral WA while Ruth and Stephen were closer to Yelm. I have to wonder if these two cases are related, and if they are, what the motive was? The fact that both couples were murdered in similar ways is very interesting, but the distance between these two murders seem to be a bit exaggerated in closeness IMO. I've also created a MAP to portray an approximation of where Diana/Mike and Ruth/Stephen were found, along with where the Robertson's daughter Crystal was found wandering. ġ985 Newspaper Clippings: here here and here Police have since ruled him out as a suspect in the double murder, and authorities now believe that an unknown serial killer may be responsible for the Harkins/Cooper and Robertson/Riemer murders. The cause of his death is publicly unknown. Suspects: Mike was the prime suspect in Diana's, Stephen's, and Ruth's murders, until Mike's skull was found in March 2011. Police had not been able to determine if he was alive or dead, or if he was the killer or a victim. ![]() He apparently had a history of domestic violence, and this, along with other evidence, was enough for police to issue a warrant for his arrest. The other theory was that Mike himself was the serial killer. Police considered two theories the first was that an unknown serial killer had killed both couples, and then hid Mike's body. Both Ruth and Diane had been killed with the tube sock tied in the same way. They were camping in the same area where Mike set his traps. His companion, Ruth Cooper, was found strangled two months later. Police believed him to be responsible for her murder as well as a double murder that occurred in the same woods four months earlier- A man named Stephen Harkins was found shot to death in his sleeping bag. His truck, which was nearby, had blood stains on the front seat and a note on the dashboard that read, "I love you, Diana." Although her mother believed that it was his handwriting, it could not be confirmed. She had been stabbed seventeen times and had a tube sock tied around her neck there was no sign of Mike. Two months later, Diana's body was found deep in the forest around Elbe, Washington. Mike and Diana had vanished without a trace, and all Crystal could tell police was that "Mommy is in the trees". She was later identified after her photo was placed in the newspaper and her maternal grandmother recognized her. That afternoon, Crystal was found wandering around a department store without her parents. ![]() Details: In December 1985, 36-year-old trapper Mike Riemer took his girlfriend, Diana Robertson, and their daughter, Crystal, into the woods near Tacoma, Washington to look for a Christmas tree.
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