In the summer of 1983, in Michigan's Upper Peninsula, 58-year-old Senia Marie Matson was with family and friends at a cabin in Trout Lake Township. The cabin was situated on the shore of Carp Lake, also known as Trout Lake. In the early morning hours of July 3rd, after consuming a significant amount of alcohol, Senia walked out of the cabin and into the surrounding woods. She was never seen or heard from again.
At the time she went missing, Senia was wearing blue jeans, a light blue sweatshirt, and maroon tennis shoes. She also wore a gold wedding band and a gold watch with a gold band. Senia had brown hair, green eyes, and wore prescription eyeglasses. She had distinctive scars on both of her breasts from mastectomies and another scar on her upper left arm from a tattoo removal.
Following her disappearance, authorities were notified and an extensive search of the area was launched. Both air and ground searches were conducted in an effort to locate any sign of Senia, but these searches yielded no clues as to her whereabouts. The Michigan State Police are the primary investigating agency for her case. It was noted by those who knew her that Senia sometimes experienced periodic memory lapses, which was a point of concern for investigators. The circumstances surrounding her vanishing left investigators with several possibilities to consider. One theory is that she may have become disoriented and lost in the dense woods surrounding the lake. Another possibility is that she may have encountered someone and accepted a ride.
Decades have passed since Senia Matson was last seen, and her case has grown cold. Despite the passage of time, her case remains open and she is listed in national missing persons databases, including NamUs under the case number MP9786. The investigation into her disappearance has been marked by a lack of evidence and few leads, making it a challenging case for law enforcement. The official narrative remains that Senia, after a night of drinking, wandered into the woods from a cabin on Carp Lake and vanished without a trace. Her family has been left without answers, and the mystery of what happened to Senia Marie Matson in the early hours of that July day continues to be an unresolved case for the Michigan State Police.
Senia Marie Matson was a 58-year-old woman when she was last seen on July 3, 1983, in Trout Lake Township, a rural community in Michigan’s Upper Peninsula. She had been staying at a cabin near the shore of Carp Lake, not far from the St. Ignace area, when an ordinary summer gathering turned into the beginning of a mystery that has endured for decades. According to the circumstances preserved in official missing-person records, Senia had consumed a large amount of alcohol before leaving the cabin on foot. She walked away from the people who had been with her, entered the surrounding woods and was never seen again. No confirmed sighting, telephone call or other communication from her has been publicly documented after she disappeared.
The area into which Senia walked was heavily wooded and could have been difficult to navigate, especially during the darkness of the early morning. Accounts associated with the case have placed her departure at approximately 4:00 a.m., when visibility would have been limited and familiar landmarks near the lake and cabin may have been difficult to recognize. Information circulated in connection with the investigation also indicated that Senia experienced periodic memory lapses. That detail heightened the concern that she could have become confused or disoriented after leaving the cabin. Investigators considered the possibility that she became lost somewhere in the forest, but another possibility was that she reached a roadway and accepted a ride away from the area. Neither explanation has ever been confirmed. Reports indicate that intensive ground and aerial searches were conducted, yet searchers found no trace of Senia, no confirmed trail leading away from the property and no discovery that explained what happened after she entered the woods.
At the time of her disappearance, Senia was described as a white woman who stood approximately 5 feet 4 inches tall and weighed about 140 pounds. She had brown hair and green eyes and normally wore prescription eyeglasses. She was believed to have been wearing blue jeans, a light blue sweatshirt and maroon tennis shoes when she left the cabin. She was also wearing a gold wedding band and a gold watch with a gold-colored band. Several physical characteristics could help distinguish her from another person, including scars on both breasts and a scar on her upper left arm. Records describe the breast scars as being associated with a complete mastectomy on one side and a partial mastectomy on the other, while the mark on her arm was reportedly left by the removal of a tattoo. These identifying details have remained important because no clothing, jewelry or personal effects definitively connected to Senia have been publicly reported as recovered from the woods or surrounding region.
The Michigan State Police has remained the investigating agency, and Senia’s disappearance is recorded under agency case number 83-690-12 and NamUs case number MP9786. The case information includes family DNA reference samples from both a daughter and a son, providing investigators with material that could be used to compare against unidentified remains located anywhere in the country. The existence of those samples reflects the painful reality faced by families in long-term missing-person cases: even after searches have ended and decades have passed, identification technology may eventually provide an answer that the original investigation could not. However, no public record reviewed for Senia’s case reports that such a comparison has identified her, and her official case listing contains no resolution indicating that she has been found alive or deceased.
Senia’s disappearance left her family without the certainty that normally follows the loss of a loved one. The known story stops at the edge of the woods: a woman leaving a lakeside cabin in the early hours of July 3, walking beneath the trees and failing to return. The limited evidence has prevented investigators from determining whether she suffered an accident, became disoriented and succumbed to the wilderness, encountered someone after reaching a road or left the area through circumstances that were never discovered. There is no publicly identified suspect, no documented evidence establishing foul play and no confirmed explanation for why repeated searches did not locate her. In overview, Senia Marie Matson was a 58-year-old woman last seen leaving a cabin near Carp Lake in Trout Lake Township, Michigan, after drinking heavily on July 3, 1983. She entered the woods on foot, disappeared without leaving a confirmed trace and remains the subject of a longstanding Michigan State Police missing-person investigation whose most important question—what happened to Senia after she walked away from the cabin—has never been answered.Last Seen: Jul 3, 1983
