On a sun-scorched Monday morning in San Diego, searchers found what the mountain had quietly claimed the day before — a 50-year-old woman who had set out to do something generous and good. Diem Le Nguyen had joined a hundred others on a charity hike up Black Mountain, then pressed ahead alone, and by mid-morning had sent a final message to her sister: she was tired, and she needed water. Her story is one the summer heat has told before — the narrow distance between determination and danger, between a trail's summit and its shadows.
Body found in San Diego believed to be missing hiker Diem Le Nguyen
A 50-year-old woman died during a charity hike, leaving family and community members grieving; circumstances suggest heat exposure and dehydration as potential factors.
she was exhausted and needed water
Mark
Why did she separate from the group in the first place?
Mimi
She felt good at the midpoint—strong enough to finish alone while the larger group rested. It's a common impulse on a hike, especially in a group setting where you might feel self-conscious about your pace.
Mark
And then she called her sister saying she was tired and needed water. That's less than 40 minutes after saying she'd summited.
Mimi
Right. Something shifted very quickly. Either the heat hit harder than she expected, or the exertion caught up with her faster than she anticipated. By the time she made that call, she was already in trouble.
Mark
The heat wave was the backdrop here, wasn't it?
Mimi
Completely. Low 90s on the mountain, an excessive heat watch in effect. She wasn't hiking in normal conditions. The body was found off-trail, a quarter-mile from civilization. She didn't make it back.
Mark
What does a quarter-mile mean in that context?
Mimi
It means she was close enough that rescue could have reached her if they'd known where to look. But in the dark, on unfamiliar terrain, with no signal perhaps, that distance becomes impossible.
Mark
The group was 100 people strong. Did anyone notice she hadn't returned?
Mimi
Eventually, yes. But there was a lag. She said she'd finished the trail at 9:30, then called her sister at 10:08 saying she was in trouble. By the time the alarm was raised and search teams mobilized, it was already Sunday night. The helicopter found her Monday morning.
The Pulse
- Nguyen separated from a 100-person fundraiser group after reaching the midpoint, choosing to finish the trail alone while temperatures climbed into the low 90s during San Diego's first heat wave of the season.
- Her last words — a call to her sister at 10:08 a.m. reporting exhaustion and thirst — set off a desperate overnight search involving more than 50 volunteers, trained dogs, and drones sweeping the mountain until darkness halted them.
- A search helicopter spotted a body off-trail Monday morning, roughly a quarter-mile from any developed area, near Nighthawk Trail — close to civilization, yet unreachably far.
- The Medical Examiner's office has yet to formally confirm the identification, but police say the remains match Nguyen's description, and the community that gathered for a fundraiser now gathers instead in grief.
On a sun-scorched Monday morning in San Diego, searchers found what the mountain had quietly claimed the day before — a 50-year-old woman who had set out to do something generous and good. Diem Le Nguyen had joined a hundred others on a charity hike up Black Mountain, then pressed ahead alone, and by mid-morning had sent a final message to her sister: she was tired, and she needed water. Her story is one the summer heat has told before — the narrow distance between determination and danger, between a trail's summit and its shadows.
On Sunday morning, Diem Le Nguyen joined nearly a hundred hikers on Black Mountain for a 5K fundraiser benefiting the Build a School Foundation — a day meant for generosity and shared effort. When the group paused to rest at the midpoint around 8 a.m., Nguyen felt capable enough to push on alone. By 9:30 a.m. she had reached the summit. But less than forty minutes later, she called her sister to say she was exhausted and desperately needed water. That call was the last anyone heard from her.
As Sunday wore on and Nguyen failed to return, search and rescue teams mobilized quickly — more than 50 volunteers, search dogs, and drones worked through the night until darkness made further searching impossible. San Diego was enduring its first heat wave of the summer, with temperatures in the low 90s and an excessive heat watch in effect for the mountains.
Monday morning, a helicopter crew spotted a body off-trail, roughly a quarter-mile from any developed area near Nighthawk Trail. Police Lieutenant Daniel Meyer addressed reporters with quiet gravity, urging the community to rally around a family now facing an unimaginable loss. The Medical Examiner will make a formal identification, but authorities believe the remains are Nguyen's.
The circumstances carry the weight of a familiar warning: a solo hiker, separated from her group, pushing through fatigue in dangerous heat without enough water, on terrain where help could not reach her in time. The mountain that was meant to be the backdrop for a charitable act became instead the site of a tragedy that leaves hard questions about heat safety, trail protocols, and the invisible line between resilience and risk.
A body discovered Monday morning on Black Mountain in San Diego is believed to be Diem Le Nguyen, a 50-year-old woman who vanished the day before while hiking. Police announced the finding at a news conference, saying the remains matched her description and were located near Nighthawk Trail. The Medical Examiner's office will confirm the identification.
Nguyen had started her Sunday morning as part of something celebratory—a group of 100 hikers participating in a 5K fundraiser for the Build a School Foundation. The hike proceeded normally until around 8 a.m., when the group reached the midpoint and stopped to rest. Nguyen, apparently feeling strong, decided to push ahead and finish the trail on her own rather than wait for the larger group. At 9:30 a.m., she reported back that she had reached the summit. But less than 40 minutes later, at 10:08 a.m., she called her sister with a different message: she was exhausted and needed water.
That call was the last contact anyone had with her. When Nguyen failed to return as expected, alarm spread quickly. Sunday night, search and rescue teams mobilized with more than 50 volunteers, trained search dogs, and drones, combing the mountain until darkness forced them to pause. The timing was grim. San Diego was in the grip of its first heat wave of the summer, with temperatures climbing into the low 90s. An excessive heat watch remained in effect for the mountains until 8 p.m. that evening.
Monday morning, a search helicopter spotted a body off-trail, roughly a quarter-mile from any developed area. The discovery came around 9:15 a.m. Police Lieutenant Daniel Meyer addressed reporters with measured words, acknowledging the weight of the moment. "At this point, it's obviously a very painful moment for the family and friends," he said. "It's really important for the community to come together and support this family as they go through this traumatic time."
The circumstances point to a familiar and preventable tragedy. A solo hiker, separated from her group, pushing through fatigue in extreme heat without adequate water, on a trail where help was distant. The story raises hard questions about trail safety protocols, about the risks of separating from groups, and about how quickly conditions can turn dangerous in a heat wave. For now, the focus remains on the family and the community that gathered for a fundraiser and instead confronts loss.
Notable Quotes
It's obviously a very painful moment for the family and friends. It's really important for the community to come together and support this family as they go through this traumatic time.— Lt. Daniel Meyer, San Diego Police Department
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