She felt like a third wheel as she was the plus one of another couple and wasn't having a good time.
She called her friend Jenny Green, expressing she didn't want to be there and wanted to leave.
Everyone pointed fingers at David Swift, her husband, as the primary suspect.
He had a history of ups and downs in his marriage with Karen and had recently injured his knee, which made him a convenient suspect.
Investigators found a burn barrel on the Swift property containing a barbell, which they believed could be the murder weapon.
Rumors and accusations spread quickly, fueled by stories of public behavior and allegations of infidelity.
She was a private investigator who brought new theories and evidence to light, stirring up the community and causing a media frenzy.
They argued he had motive due to his controlling nature and the breakdown of his marriage with Karen, as well as opportunity as he was the only adult in the house when Karen went missing.
They claimed there was no physical evidence linking David to the crime and that his bad knee made it impossible for him to have committed the murder.
The jury could not reach a unanimous decision, resulting in a hung jury and a mistrial.
After a Halloween party at a country club, a wife and mother of four vanishes. Nearly a decade later, a private investigator claims to uncover chilling new clues that turn the town upside down. Keith Morrison reports.