WILDLIFE ENCOUNTERS -- Three grizzly bears have been captured and fitted with radio collars in Yellowstone National Park to help investigators determine which bear might be responsible for last month's mauling death of a Michigan man.

Park spokesman Al Nash said Wednesday that two adult male bears were captured Sunday in the Hayden Valley area, where 59-year-old John Wallace of Chassell, Mich., was killed on Aug. 25 while hiking alone in the park’s backcountry.

Another bear captured last week also was released after being radio collared.

Nash says hair samples were taken from the animals for DNA testing. The bears were fitted with radio collars for tracking and released.

Park officials have said they will kill the bear that mauled Wallace if they can confirm its role through DNA analysis.