A 58-year-old hiker was found dead near a mountain summit in Maine while his 28-year-old daughter remains missing, authorities said Tuesday.

The body of Tim Keiderling was located around 2:45 p.m. Tuesday on the Tableland near the summit of Mount Katahdin, the Maine Department of Inland Fisheries and Wildlife said. 

Search efforts were ongoing for Keiderling’s daughter, Esther, officials said.

Tim and Esther Keiderling, both from Ulster Park, New York, were last seen leaving the Abol Campground around 10:15 a.m. on Sunday morning to hike toward the summit of Katahdin, which is in Baxter State Park and is notably the northern terminus of the Appalachian Trail.

More than 30 Maine Game Wardens, the Warden Service’s K-9 and Search and Rescue teams, Maine Forest Service helicopters and the Maine Army National Guard have taken part in the search for the father and daughter.

Mount Katahdin has an elevation of 5,267 feet, and is the northern terminus of the Appalachian Trail. (Shawn Patrick Ouellette/Portland Press Herald via Getty Images, File)

The Hunt and Abol Trails were closed on Tuesday due to the search effort.

The Baxter State Park website notes that Katahdin is a “very strenuous climb,” with an average round trip taking 8 to 12 hours.

Katahdin is the tallest mountain in Maine, with an elevation of about 5,270 feet.