On the afternoon of December 7, 1958, five members of the Martin family piled into their Ford station wagon. With Christmas around the corner, the family had decided to drive to the Columbia River Gorge to collect greenery to decorate their Portland home.Presumably planning to be back shortly, they left dishes in the sink and laundry in the washing machine. But the Martins never returned home. At some point on their drive that winter day, they disappeared, never to be seen alive again.KOINFive members of the Martin family vanished on December 7, 1958. Only eldest child Donald Martin survived.For years, detectives tried to crack the case of the missing family of five. It wasnt until 2024 that their car was found in the Columbia River, with human remains uncovered the following year and subjected to DNA analysis. And finally, in April 2026, the DNA was found to be a match and the remaining members of the Martin family had officially been identified.But still, several haunting question remain. How did the Martin familys car end up in the Columbia River? And does certain evidence suggest that the familys oldest child and sole survivor, Donald Martin, may have had a hand in the disappearance?The Final Hours Of The Martin Family Before They DisappearedThe night before he disappeared, 54-year-old Kenneth Martin put on a Santa suit and attended a Christmas party, where he handed out candy canes to his neighbors a family tradition.By the following day, Kenneth still hadnt put the Santa suit away, so it still laid out by the time the Martin family left for their Sunday drive. His wife, 48-year-old Barbara Martin, had left a load of laundry in the machine, The Charley Project reports.Multnomah County SheriffThe three Martin sisters who vanished in 1958.Their oldest daughter, Barbie, was a 14-year-old freshman at the local high school. She and her younger sisters Virginia, 13, and Sue, 11, piled into the back of the familys cream- and red-colored car for the afternoon trip.The Martin family made at least two stops before they disappeared. They ate at a restaurant in Hood River, Oregon, about 60 miles from Portland. And they purchased gasoline at Cascade Locks, about 40 miles up the Columbia River from home.But after filling up the tank, the family seemingly vanished. When they never returned to Portland, their friends called the police. But there were few clues in the case of the missing Martins.Early Leads In The Case Of The Lost Martin FamilyThe sudden disappearance of this family of five left the police baffled. Despite multiple searches, investigators couldnt find a single trace of the family or even their station wagon.The Medford Mail Tribune reported that the first clue arrived in the Martin familys mailbox two weeks after they disappeared: a gas station receipt showing that Kenneth Martin had signed for five gallons of gas on the day of their disappearance. No money had been removed from the Martin familys bank account since.The receipt led authorities to Cascade Locks, the last place the family was seen. But when the discovery turned up no new helpful information, it seemed like another dead end.Wikimedia CommonsThe Martins drove a 1954 Ford Country Squire.Hundreds of calls and letters poured in with tips, as alleged sightings of the family members came in from across the country. One woman even called in to say that shed had a vision that the family was in water by a totem pole. But none of these tips brought the police closer to the missing family.The Bodies Of Virginia And Sue Martin Are DiscoveredAuthorities continued to scour the forests within a 50-mile radius of Portland. Then, in February 1959, they stumbled upon another clue: a set of tire tracks on a bluff overlooking the Columbia River that matched the familys 1954 Ford station wagon.Alarmingly, the tracks seemed to run right off of the cliff. Did the lost Martin family tumble into the river while backing up?Hoping to find the car, the Army Corps of Engineers lowered the water level behind Bonneville Dam. But the search proved unsuccessful.St. Louis Post-DispatchSue Martin was only 11 years old when she and her family went missing. Five months later, her body washed up in the Columbia River.Months went by before the next break in the case. Finally, in May 1959, more than five months after the family went missing, authorities found the bodies of Virginia and Sue floating in the Columbia River.Their cause of death was officially listed as drowning. However, Virginia Martins body was found with a mysterious hole in her skull and because the girls bodies had been decomposing for so long, an autopsy could not definitively reveal what might have caused it.Meanwhile, Kenneth, Barbara, and Barbie remained missing. Had they died, too? Or were they still out there somewhere?The Curious Story Of Donald Martin, The Sole Surviving Family MemberOnly one member of the Martin family survived: Donald Martin, the oldest child, who was 28 when his family went missing. A Navy veteran, he was attending graduate school in New York, all the way across the country from Portland.Donald did not return home for his sisters memorial service though he did come home to settle his familys estate.I know of no one who would murder my folks or no reason for it but I dont see how it could have been an accident, Donald told Detective Walter Graven at the time, according to KOIN 6.Graven spent years trying to unravel the case of the lost Martin family. And he came to an unsettling conclusion: Donald might have been involved in their disappearance.In his notebook, Graven scrawled, It had to be planned out by . He scratched out the name of the suspect above the words, no one else with a motive. And according to one investigators computer enhancement, the scratched-out name was Donald.KOINA note Detective Graven wrote about his suspicion that Donald Martin was involved in his familys disappearance.Another piece of evidence linked Donald to the disappearance: an alegedly bloody gun found near a stolen car that had been abandoned in Cascade Locks, where the Martins were last seen alive.It was completely coated with dried blood from whatever they had clubbed, explained Bonnie Cox, whose husband found the gun. They had clubbed something to death apparently.The Coxes turned the gun over to the local sheriff, but bafflingly, the sheriff never processed it for evidence.Multnomah County SheriffFriends and family raised money to offer a reward for information about the missing Martin family.Later, detectives realized that the gun had a surprising connection to Donald Martin. A few years earlier, Donald had worked at a local sporting goods store before he was fired for allegedly stealing goods including the handgun found near where his family vanished.Some Resolution In The Martin Family Case Nearly Seven Decades LaterWith the case turning cold, Detective Graven wrote in his notes, Even though I can get no cooperation from anyone, there is no murder that cant be solved.But Graven never solved the case of the lost Martin family. He died in 1988. And Donald Martin died in 2004. Some 60 years after the Martins vanished, their disappearance remained unsolved.St. Louis Post-DispatchThe disappearance of the Martin family made headlines across the country even months later, as new clues emerged.Finally, in 2024, a civilian diver whod gotten interested in the case named Archer Mayo found the Martin familys car in the Columbia River, and then found human remains therein the following year. And eventually, in April 2026, DNA from those remains was positively linked to the Martin family.But though their remains had been found, we still dont know exactly why they ended up in the Columbia River.What happened to the Martin family? The evidence points to two leading possibilities. After putting five gallons of gas in his car, Kenneth Martin might have accidentally backed over a bluff, plunging the familys station wagon into the Columbia River.Then, theres the more sinister possibility, that the Martin family might have been the victims of a crime. A stolen car and a bloody gun linked to the only surviving member of the family paint a dark picture, but was Donald Martin actually involved?For now, although the bodies of the Martin family have finally all been recovered, the story of what exactly happened to them remains shrouded in mystery.A disturbing number of disappearances and murders remain unsolved. Next, read about cold cases that still baffle detectives to this day. Then, learn about the strange disappearance of Bobby Dunbar and the doppelganger who replaced him.The post In 1958, The Martin Family Suddenly Vanished And Oregon Police Still Dont Know Exactly What Happened appeared first on All That's Interesting.