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Elk Point, S.D. - Cheryl Miller and Pamella Jackson had planned to celebrate the end of the 1971 school year by gathering with classmates at a quarry along a gravel road.
But the 17-year-old girls weren't known for going to parties, so when they didn't show up, other teens just assumed they had changed plans.
It soon became clear that the well-liked pair from the farming town of Alcester, S.D., had vanished. Now the 43-year-old mystery has been solved, largely by the ebb and flow of a dirty creek and the contents of a well-preserved purse, which indicate the girls likely died after their car plunged into the water.
"This has really been a tragedy for two families, a tragedy for a class, as well as all of South Dakota, to some degree," state Attorney General Marty Jackley said this week.
The questions began on the night of May 19, 1971. After visiting Miller's ailing grandmother at a hospital, the girls met up with some boys at a church parking lot and started to follow them to the quarry. Miller drove a beige 1960 Studebaker Lark that had belonged to her grandmother. Jackson was in the passenger's seat.
The boys missed a turn and drove right past the party. When they turned around, they told authorities, they no longer saw the Studebaker's headlights. They figured the girls lost the nerve to attend the party.
The celebration went on, but the girls and the Studebaker would not be seen again until 2013.
In the following weeks, volunteers and law-enforcement officers searched the gravel pit, local roads and even the nearby Missouri River, but found nothing. The mystery persisted for more than four decades, tormenting the girls' families, baffling investigators and inviting false allegations against a sex offender.
Every time the girls' classmates reunited, the disappearance came up.
"We were always curious," said Dwight Iverson, a classmate who now runs a restaurant and convenience store in nearby Vermillion. "We would talk about it. That car has to be somewhere on this planet, and it's never been found."
At one point, the state's cold-case unit reopened the investigation after a prison snitch implicated a fellow classmate who had lived nearby and was behind bars for raping a woman. Authorities concluded he made the story up.
Then in September, flooding followed by a drought brought the car into view. It was upside-down in Brule Creek next to the gravel pit where the girls had been headed. A fisherman spotted two tires sticking above the water.
On Tuesday, authorities held a news conference to confirm what townspeople had suspected since the car re-emerged: The remains inside were those of Miller and Jackson.
The evidence seemed frozen in time. A picture of Mount Rushmore on the white license plate was clearly visible, as were the green registration numbers. A watch still had its strap and clearly showed the time it stopped, 10:20.
Miller's purse was intact, containing her driver's license, coins, a couple of letters from friends and other items, all in relatively good shape for being submerged for so long. Those belongings and DNA were used to identify the remains.
There's no evidence the teens had been drinking. And mechanical tests on the car did not suggest any foul play. The headlight switch on the dashboard was on. The car was in high gear, and both girls were found in the front seat. Those factors point to an accident, Jackley said.
Investigators would not speculate on exactly what happened, though one of the tires was damaged and the tread was thin, Jackley added.
Ray Hofman, who knew the Miller family and searched for the teens during his career with the Vermillion Police Department, said the two probably lost track of the narrow, dusty road and accidentally drove into the creek.
"Those boys were kicking up gravel at nighttime. Those girls couldn't see the bridge," he said.
Seeing an old car embedded in a muddy bank wouldn't necessarily attract suspicion. The landscape is dotted with rusting vehicles, farm machines and other contraptions. Some were put there to curb erosion. Others were simply abandoned.
Jackson's late mother, Adele, told people the loss of a daughter was especially hard on her husband, Oscar.
"She said just about every night after supper, he'd go out driving around the countryside looking for that Studebaker," said Paul Buum, publisher of the local newspaper, the Alcester Union and Hudsonite.
Oscar Jackson died at age 102, five days before the car was found. An obituary noted that his daughter's disappearance was his "greatest sadness."
Associated Press researcher Jennifer Farrar in New York contributed to this story.