A 21-year-old New Jersey hiker died of hypothermia after slipping off a trail near the summit of Mount Marcy and calling 911 to report she could not climb back to safety, as clouds and harsh winter conditions slowed a multiagency search, New York authorities said.
The hiker, Brianna L. Mohr of Brick, New Jersey, was found late Feb. 12 in the Adirondack High Peaks after state forest rangers, state police and aviation teams searched for hours in deep snow and poor visibility. Officials said Mohr’s dog was located alive beside her. An autopsy completed two days later determined the cause of death was hypothermia, authorities said.
State police said forest rangers were notified around 3 p.m. on Thu., Feb. 12, that a hiker and her dog were in distress on Mount Marcy, the highest peak in New York. Authorities said Mohr was able to reach 911 and describe that she was off the marked trail near the top of the mountain and could not get back up. Rangers deployed quickly and began what state police described as an extensive search across steep terrain with heavy snow, using snowmobiles and a tracked vehicle to move personnel and equipment as high as conditions allowed before teams continued on foot.
As daylight faded, officials said the search became more complicated. Heavy cloud cover and poor visibility limited the use of helicopters and made it harder to pinpoint Mohr’s location near the summit. Teams attempted approaches from multiple directions while aviation crews searched above the mountain when brief windows opened, authorities said. A forest ranger reached 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 was rescued and described as uninjured. Authorities did not release details about the dog’s custody after the rescue, but officials noted the animal was found beside Mohr, a detail that drew widespread attention as word of the incident spread through the hiking community and across social media.
Officials said an autopsy completed Feb. 14 determined Mohr died of hypothermia. Authorities said weather affected not only the search but also the recovery operation. With conditions still dangerous on the upper mountain, officials said the removal of her body was delayed until the next day, when a state police helicopter was able to assist with a hoist operation.
Authorities did not publicly detail how far Mohr fell or the exact location where she landed, beyond saying she was near the summit and could not return to the trail. They also did not say whether Mohr remained in contact with dispatchers after her initial report or whether she was able to provide coordinates. Officials have not released a transcript or recording of the 911 call. Their public account has focused on the basic timeline: notification in midafternoon, a multi-hour winter search, and the discovery near 10 p.m. in a summit area known for fast-changing weather.
Mount Marcy rises to 5,344 feet and is widely regarded as a demanding winter climb, even for experienced hikers. The summit region can be exposed to wind and sudden whiteout conditions, and the High Peaks often hold deep snow well into late winter. Authorities said the Feb. 12 rescue effort involved steep terrain and limited visibility, conditions that can slow ground teams and reduce the usefulness of aircraft in a search.
Publicly available reports from the region described bitter cold on the mountain and surrounding High Peaks that day. Even when temperatures are higher at trailheads, mountain weather can change quickly with elevation, and wind can drive dangerous wind chill near open ridgelines and summits. Officials said those factors contributed to the complexity of the response as teams tried to reach someone who had slipped off a marked trail and could not climb back.
Mohr’s death prompted tributes from family members and friends, who described her as an outdoors enthusiast who frequently traveled and hiked with her dog. Loved ones posted photos and messages remembering her as adventurous and close to her family. A brother wrote that she had been a role model to him, and her mother said the family was devastated. Friends described a young woman who sought quiet trails and scenic views and who shared nature photography and travel posts online.
Local reporting said Mohr graduated in 2022 from Brick Memorial High School. Friends said she enjoyed visiting national parks and mountain areas across the country and had shared images from winter outings in the Adirondacks in the months before her death. After authorities released her name and the autopsy findings, the story spread quickly through outdoor groups and among hikers who follow Adirondack rescue operations.
Authorities said they have not announced any criminal investigation connected to the death and described the incident as a rescue response that became a recovery. In winter rescues, officials often emphasize that response times can stretch because travel to the summit takes hours even in good weather, and storms can close off aircraft support. In this case, officials said cloud cover and poor visibility prevented helicopters from accessing the summit area for long stretches, forcing crews to rely heavily on ground teams.
Search operations on Mount Marcy and other High Peaks frequently require large deployments, officials have said in prior rescue summaries, because terrain is steep and snow can make travel slow and exhausting. Rangers often use a combination of snowmobiles, tracked vehicles and foot travel, with aviation teams assisting when weather permits. In this case, state police said rangers used mechanized equipment to move as far as possible through deep snow and steep terrain, then continued upward on foot toward the upper mountain.
The incident also highlighted a challenge rescuers regularly face in the High Peaks: locating someone who is off the marked trail when visibility is poor. When a person slips into woods, down a slope, or into a drainage near the summit, the search area can expand quickly, and tracks can be obscured by wind and snowfall. Officials did not describe whether Mohr had a GPS device or whether her phone signal provided a precise location, and they did not say whether she had emergency shelter or extra layers with her.
While authorities did not release details about Mohr’s gear, the combination of time, cold and exposure near the summit became central to the outcome described by the medical examiner. Hypothermia can set in when the body loses heat faster than it can produce it, and risk increases with wet clothing, wind, fatigue and immobility. Rescue officials have said in many mountain incidents that a fall off trail can quickly turn into an emergency when a person cannot move, cannot regain a route, or loses the ability to keep warm.
Officials have not announced changes in policy tied to Mohr’s death, but the case renewed attention on the risks of winter hiking in the Adirondack High Peaks and the limits that weather can impose on rescue operations. Rangers and state police said their focus was on reaching Mohr after her emergency call and coordinating resources in difficult conditions. They highlighted the coordinated response and the ranger who ultimately reached her location late that night.
For now, authorities have not said whether they will release additional details about Mohr’s call, her intended route, or where she slipped off the trail. They also have not provided information about whether she was hiking alone aside from her dog, or how long she had been on the mountain before contacting 911. The public record remains centered on the timeline of the response and the medical examiner’s conclusion.
Mohr’s death has reverberated among hikers who regularly climb Mount Marcy, especially in winter, when trail conditions can be severe and daylight is limited. The mountain’s popularity and status as New York’s highest peak draw visitors year-round, but authorities have said winter rescues can demand long, physically taxing operations and may unfold under the same weather hazards that caused the initial emergency.
The case closed with a confirmed cause of death and the rescue of Mohr’s dog, but it left a painful gap between an afternoon call for help and a late-night discovery near the summit. Authorities said the operation involved coordinated planning and long hours by multiple teams, carried out in cloud cover and poor visibility that limited aircraft and slowed the approach on foot.
Author note: Last updated February 20, 2026.