Dozens of runners ascended and descended Bird Ridge Trail on Sunday for an annual Father's Day foot race.
Alaska State Troopers said Sunday that the boy's remains were airlifted from the scene.
A Chugach State Park ranger shot the 250-pound (113-kilogram) bear in the face, but the animal ran away.
Patrick was found around 500 yards off the trail in steep, heavily wooded terrain, Mr Crockett added. Just before his death, the teen texted his mom to tell her a bear was chasing him. Names of the victims have not been released. "Like this", said Precosky. According to The Washington Post, another runner told officials he had seen a bear circling a teen. "We do not know what species of bear it is".
As runners continued down the hill, one runner came barreling down saying there had been an attack, and the entire race crew went into crisis mode.
Despite that, Precosky said that because there are so many people out and making noise during a wilderness race, that cuts down on the risk of a person having an encounter with a bear, compared to if a person was out running in the same area on his/her own.
The runner, who was not identified, was found dead from injuries he sustained in the mauling shortly after 1 p.m. near the Bird Ridge Trail north of Girdwood, Alaska State Troopers spokeswoman Megan Peters told TIME on Monday.
Matt Wedeking, division operations manager with Alaska State Parks, said the predatory behavior of the bear in the attack on the teen was not normal.
"If I noticed a bear was stalking me", he said, "I'd pick up a big stick and a rock. This was just a large black bear", Mitchell said.
When a black bear does attack a person, usually it's what Garshelis calls a defensive attack.
Such an attack, Marsh said, is extremely rare. "Everyone was very nervous, we didn't know what we were dealing with".
Back-to-back deadly maulings of teenage boy and a contract worker by black bears in Alaska appear to be horrifying flukes by rogue animals, experts said Tuesday.
As family and the community mourn, for now, that bear continues to wander the trails, which remained closed as of Sunday night.
While black bear attacks are far less common than brown or grizzly bear encounters, black bears tend to be more "predatory", said Smith, who lives in Utah but still has property on the Kenai Peninsula's Skilak Lake.