Carol Andersen was a rising junior in Nevada during the summer of 1979. On June 30th, she left to attend a party despite her mother's wishes. Carol suffered from epilepsy and was rarely allowed to go out. The night she left was the last time her family saw her alive. Investigators believe that she hung out with friends at Regan's Beach and later got a ride to a party near the Heavenly Mountain Ski Resort. As people were leaving the party, several of them offered her a ride home but she wanted to stay behind. It is believed that she left the party at 11:30 that night but whether it was on foot or with someone is unknown.

In the early morning hours of July 1st, she was found dead on the side of the road. She was located four miles from the party and had been strangled to death. It's unknown if she was picked up by someone she knew or if she had been abducted. Her sister believes she was targeted. She's hoping for someone to come forward with information.

New push to solve teen's 1979 cold case murder

El Dorado County investigators believe that on the night of her death, Carol hung out with friends at Regan's Beach on the banks of Lake Tahoe, before catching a ride to the party on Regina Road, near the Heavenly Mountain Ski Resort. Later in the evening, several people offered her a ride home, but she turned them down, according to the El Dorado County District Attorney's Office.

Investigators say she left the party around 11:30 that night, but it's not clear whether she left on foot or got a ride. What happened next remains a mystery. Just a few hours later, in the early morning hours of July 1, 1979, Carol was discovered dead along the side of the road about four miles away. Investigators say she had been strangled.
The murder was devastating to her family, said Andersen, who was seven at the time. Their mother Delorse died about a year later, without knowing who killed her daughter. Though it's been decades since her sister's murder, Andersen is convinced that someone knows something, and she's asking anyone with information to come forward.