I just watched a YT video about this still unsolved case from 1993. Stephanie Coyle, age 74, was found nude, throat was cut, she had been slashed a dozen times then raped and molested. Also, there was a symbol carved on her back.
From a 2011 news report.
Forensic Pathologist Dr. Cyril Wecht performed the autopsy. He told Target 11 Investigator Rick Earle that he's done thousands of autopsies and this is one of the most brutal he's ever seen.
Stephanie Coyle was found on the floor or her bedroom in her Arnold apartment in July of 1993. After she failed to show for her volunteer job, her landlord went to check on her and discovered her body.
"This is truly one of the most brutal killings I've ever experienced in my role as a forensic pathologist," Wecht said.
On the victim's back, Wecht discovered a strange carving that he suspects was done with a knife after Coyle had been killed.
"It suggests some kind of symbol. This was the final message. It could even be some kind of initiation ritual," said Wecht.
Investigators won't release any photos of the carving, but according to Wecht it was an oval about 21 inches by 14 inches with a vertical line 25 inches long through the middle of the circle. The carving was about a quarter inch deep.
It was a shocking crime in a quiet neighborhood. An elderly woman found brutally stabbed to death with a strange carving on her back.
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