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Human skeletal remains were discovered last week at Joshua Tree National Park in California after park researchers found a backpack that belonged to a hiker missing since May, officials said Tuesday.

The remains were found Thursday off a trail in the Black Rock area of the park near where the unattended belongings of Trammell Evans, 25, were located, the National Park Service said.

Evans was last seen when he was dropped off at the Black Rock Campground on April 30. He was reported missing on May 5 after failing to return from his trip on time, prompting rescuers to immediately launch a search. 

Evans planned to hike from Black Rock to Geology Tour Road before returning to Black Rock by trekking across the California Riding and Hiking Trail. The route was about a 60-mile roundtrip.

HIKER FROM CALIFORNIA DIES SUDDENLY AT UTAH'S ZION NATIONAL PARK

Trammell Evans

Trammell Evans was reported missing on May 5 after he was overdue from his trip at Joshua Tree National Park.  (National Park Service)

Officials described Evans as "an athletic and experienced long-distance hiker" who was familiar with the trails and high desert at Joshua Tree National Park. 

Trammell Evans on trail

When Trammell was reported missing on May 5, rangers immediately launched a search and rescue team of highly trained trackers, searchers, and climbers to find Trammell. (National Park Service)

Evans did not register for a backcountry use permit before setting off on his trip, according to NPS. Officials said his last known place of residence was Los Angeles, but noted that he moved frequently.

Trammell Evans on trail at night

A backpack determined to belong to Trammell was found near the human skeletal remains. The identity of the remains and cause of death have yet to be determined. (National Park Service)

23 SKIERS AND SNOWBOARDERS RESCUED FROM VERMONT BACKCOUNTRY AFTER GETTING LOST IN FRIGID TEMPERATURES

The Riverside County Coroner’s Bureau is working to positively identify the remains and determine a cause of death. Officials said the investigation is ongoing.

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Authorities ask anyone with any additional information to contact Palm Desert Sheriff Station 760- 836-1600 or call anonymously at 760-341-7867 and reference incident # O240250071.