UPDATE: Park rangers captured and euthanized a grizzly bear sow, after linking her to the scene of two fatal maulings of hikers. Her cubs were captured and will spend the rest of their lives in captivity. For our complete report on the capture and killing of the grizzly, click here.
ORIGINAL STORY: Yellowstone Park rangers and wildlife officials have captured and tested three male grizzly bears in the area where a Michigan hiker was mauled to death, but an official said the attacker may never be known.
Park spokesperson Al Nash on Sept. 7, 2011 said the three large males were trapped some time since the start of the Labor Day weekend. DNA samples were taken, the bears collared with tracking devices, then released back into the wild.
"The samples will be sent out for DNA testing, and the incident remains under investigation," Nash told OldWestNewWest.com Travel & History Magazine. "But at the present time, we are not able to draw any conclusions."
The elusive grizzly remains loose in the Yellowstone backcountry.
"While we feel DNA testing may help us resolve the circumstances surrounding the attack, it is possible we may never be able to resolve the issue," he added.
John Wallace, of Chassell, Mich., died Thursday, Aug. 25, 2011 of traumatic injuries from a grizzly bear attack. Wallace was traveling alone, and had pitched a tent in a park campground sometime Wednesday.
His body was discovered Friday morning by two hikers along the Mary Mountain Trail. The 21-mile-long trail crosses the center of Yellowstone, connecting the west and east sides of the lower portion of the Grand Loop Road.
"Mary Mountain Trail, the Signet Lakes Trail and the Haden Valley west of the Grand Loop Road are closed to any visitor activity indefinitely," he said.
With Labor Day Weekend over, the park is beginning the process to close many facilities to the public.
"All of the services around the Roosevelt Area, including the lodge and the mini store, are closed for the season," he said.
"Between now and early November, services will continue to phase out," he added. "We will close the interior roads to travel after the first full weekend in November. Winter weather will be hear at some point."
For more information about conditions, visit the park's Website at www.nps.gov/yell .
To see our earlier coverage, click here.