On Saturday night, "48 Hours" will examine the 1989 murder of Mandy Stavik. Once a cold case, a team of detectives persisted for decades in order to bring the person responsible for the crime to justice.

Stavik, who was 18 at the time, had gone missing the day after Thanksgiving while she was out for a run with her dog. Following her disappearance, "there was a massive hunt for her" and "everybody was out looking," states an interviewee in a clip of the upcoming episode, which can be seen below.

According to ABC News, a search-and-rescue team found a pair of green sweatpants, which were sent to a lab for analysis. They were never positively connected to her, but on the third day of the search, Stavik's body was recovered. She was found in knee-deep water in a river that was only a few miles from her home. Police also learned that she had been sexually assaulted and then drowned.

"There was a killer out there somewhere," says "48 Hours" host Peter Van Sant, adding, "The question is was this person going to strike again?"

The case would remain unsolved for over 20 years. However, an unexpected lead would come in June 2013 when two women at a water park would give investigators "the break in this case." On Saturday night, viewers will be able to see how the story unfolded and the case reached its conclusion.

This episode of "48 Hours" will air Saturday at 10 p.m. on CBS.

Police Car
In this photo, police cars sit on Main Street in Dallas, Texas, on July 7, 2016. Laura Buckman/AFP/Getty Images