A 21-year-old New Jersey hiker died of hypothermia after she slipped off a trail near the summit of Mount Marcy, New York’s highest peak, and called 911 for help as clouds and harsh winter conditions slowed rescuers, state police and forest rangers said.
Brianna L. Mohr, of Brick, New Jersey, was hiking with her dog on Feb. 12 when she reported that she had fallen from the trail and could not climb back to it, authorities said. A wide search that included forest rangers, state police and aviation teams ended hours later when a ranger located her near the summit late that night. Officials said her dog was found alive beside her.
State police said forest rangers were notified around 3 p.m. Feb. 12 that a hiker and her dog were in distress on Mount Marcy, part of the Adirondack High Peaks in northeastern New York. Officials said Mohr was able to reach 911 and describe that she was off the marked trail near the top of the mountain. Rangers deployed quickly and began what state police described as an extensive search, using snowmobiles and a tracked vehicle to move through deep snow and steep terrain.
As the hours passed, officials said heavy cloud cover and poor visibility limited the use of helicopters and slowed efforts to pinpoint Mohr’s location. Teams tried to reach her from multiple directions while aviation crews searched above the mountain when conditions allowed, authorities said. Late Thursday, a forest ranger found Mohr near the summit at about 10 p.m., officials said. She showed no signs of life and was pronounced dead at the scene. Her dog, which authorities said was uninjured, was rescued.
An autopsy later determined Mohr died of hypothermia, state police said. The autopsy was completed Feb. 14, officials said, and the cause of death was released after the examination. Authorities said weather also affected the recovery operation, delaying the removal of her body until the next day because conditions on the mountain remained dangerous and visibility stayed limited into the night.
Officials did not publicly detail how far Mohr fell or the exact spot where she landed, but they said she was near the summit and could not return to the trail. Mount Marcy rises above 5,000 feet and is known for fast-changing winter weather, including wind, whiteout conditions and extreme cold that can arrive without warning. Reports from the time of the search described bitter temperatures in the High Peaks region as teams worked to reach the area.
Mohr’s death drew attention across the hiking community because of the timing of her call and the length of the rescue effort. Officials said she contacted emergency dispatchers in the afternoon and was located more than six hours later. In statements released after the search, authorities emphasized the combination of terrain, distance and weather, describing the operation as a complex effort carried out on a remote section of the state’s tallest mountain.
Mohr’s family and friends remembered her in online tributes as an outdoors lover who traveled widely and often hiked with her dog. Relatives described her as adventurous and close to her family, sharing photos from trips and posts about her life in the months leading up to her death. Her brother wrote that she had been a role model to him, and her mother posted that the loss left the family devastated. Those messages spread quickly as news organizations reported the autopsy results and officials released her name.
Mohr was a 2022 graduate of Brick Memorial High School, local reporting said, and she had built a following for nature photography and travel posts. Friends said she enjoyed remote places and had visited national parks and mountain areas across the country. In recent months, she shared photos from winter outings in the Adirondacks, including images of herself and her dog at popular High Peaks landmarks.
New York State Forest Rangers and state police have not announced any separate criminal investigation connected to her death, and authorities described it as a rescue response that became a recovery. Officials said their focus was on reaching Mohr after her emergency call and coordinating resources in difficult conditions. The ranger who found her was part of a broader effort that included multiple teams moving on foot and by snowmobile, and aviation crews who tried to assist when weather opened brief windows for flight.
Mohr’s dog has become a central part of how the case has been shared publicly, with officials noting the animal was found alive at her side near the summit. Authorities did not release details about where the dog was taken after the rescue or who now has custody. Friends said the dog frequently accompanied her on hikes and trips, appearing in many of her photos and posts.
The incident has also renewed attention on the challenges search teams face in the Adirondack High Peaks in winter. The region draws hikers year-round, and rescues can require large deployments because steep trails and heavy snow make travel slow. Officials have described Mount Marcy searches as especially demanding because the routes to the summit can take hours even in better weather, and winter storms can shut down helicopters and limit radio communications near the upper slopes.
In this case, state police said cloud cover prevented aircraft from accessing the area for long stretches, forcing crews to rely on ground teams to reach the summit. Rangers used a tracked vehicle and snowmobiles to move equipment and personnel as high as possible, then continued on foot toward the upper mountain, officials said. The time it took to locate Mohr reflects the difficulty of searching near the summit when visibility is low and a person is off the marked trail, officials said.
Authorities have not released a transcript of Mohr’s 911 call or said whether she remained in contact with dispatchers after the initial report. They also have not said what clothing or gear she carried, or whether she had planned to hike alone aside from the dog. Officials have focused public statements on the known timeline: notification in the midafternoon, a multi-hour search, and the discovery near 10 p.m. near the summit.
Friends said Mohr was careful and experienced outdoors, and they described her as someone who looked for quiet trails and scenic views. In posts shared after her death, some friends wrote that she found peace in the mountains and believed the outdoors helped her reset and feel grounded. Others said she had talked about future trips and had plans for more hiking in the months ahead.
Mohr’s death has led to a renewed conversation among local officials and rescue groups about how quickly conditions can change on Mount Marcy and how limited visibility can affect response time. Forest rangers and state police have not announced any new policies tied to the incident, but they said the search involved coordinated planning and long hours by multiple teams. Officials also highlighted the work of the ranger who ultimately reached the location and confirmed Mohr had died.
As of Wednesday, authorities said the case had moved from a missing and distressed hiker response to a concluded investigation into the cause of death, with the medical examiner’s findings confirming hypothermia. No memorial details were announced by officials, and the family’s public posts focused on grief and remembrance.
Author note: Last updated February 19, 2026.