Hospital: Teen who was shot at Colo. school dies 
| FILE - In this Saturday, Dec. 14, 2013, file photo, Arapahoe County Sheriff Grayson Robinson holds a picture of Claire Davis, the 17-year-old student who was shot in the head by a classmate, during a briefing at Arapahoe High School in Centennial, Colo. Hospital officials said in a statement Saturday, Dec. 21, 2013, that Davis has died. | 
     LITTLETON, Colo. 
    (AP) -- A suburban Denver high school student who was shot in the 
head by a classmate died Saturday afternoon, hospital officials said in a
 statement.
Claire Davis, 17, was in critical 
condition after being shot at point-blank range at Arapahoe High School 
on Dec. 13. Friends and well-wishers had posted prayers online and 
raised money to help pay for her medical care.
"It
 is with heavy hearts that we share that at 4:29 p.m. this afternoon, 
Claire Davis passed away, with her family at her side," the statement 
from Littleton Adventist Hospital.
"Despite 
the best efforts of our physicians and nursing staff, and Claire's 
fighting spirit, her injuries were too severe and the most advanced 
medical treatments could not prevent this tragic loss of life. Claire's 
death is immensely heartbreaking for our entire community, our staff and
 our families."
Karl Pierson, 18, shot Davis, 
who just happened to be sitting nearby with a friend as Pierson, armed 
with a shotgun, ammunition strapped to his body, Molotov cocktails and a
 machete, entered the school and headed toward the library. Davis 
appeared to be a random target, Arapahoe County Sheriff Grayson Robinson
 has said.
Pierson likely intended to track 
down a librarian who had disciplined him, but Robinson said Pierson's 
arsenal suggested Pierson intended to hurt many others at the school 
just 8 miles from Columbine High School.
Pierson
 set off one of the incendiary devices and fired five shots before 
killing himself just one minute and 20 seconds after entering the 
building. He knew a sheriff's deputy assigned to the school was closing 
in, Robinson said at a news conference.
Senior
 Chris Davis, who is not related to Claire Davis, said she loved horses,
 had a lot of friends and always seemed happy. Chris Davis, whose locker
 is next to Claire's, helped organize a fundraising effort for her 
family.
Students held vigils for Davis after the shooting. Typical was a story told by classmate Maggie Hurlbut.
"One
 time I remember I was upset in the hallway, and she came up to me and 
she just - it was like, `Hey Maggie, I know we don't know each other 
well but are you doing OK?' And I told her yeah, and she was like, 
`Anything you need, I'm here for you,'" Hurlbut said. "Again, that's who
 she is, and she just wants to take care of others, and that was really 
just a good representation of her character and who she was."
Gov. John Hickenlooper visited Davis and her family at the hospital and had asked for prayers.
Sheriff Robinson called Davis "a young woman of principle" and "an innocent young lady."
Pierson's
 original target was believed to be a librarian who coached the school's
 speech and debate team. Pierson was a skilled speaker and debater on 
the team. The librarian, whose name was not released, had disciplined 
the teen in September for reasons that haven't been disclosed. Robinson 
said Pierson had made some sort of threat against the librarian in 
September.
"We are looking into that, to the 
degree that it was understood, and then what interactions or 
interventions took place," the sheriff said.
The librarian was able to escape the school unharmed, Robinson said.
Pierson
 legally purchased his shotgun at a local store a week before the 
shooting and bought the ammunition the day of the shooting. Anyone 18 
and older is allowed to buy a shotgun in Colorado; only those over 21 
can legally buy a handgun.
Pierson, whose 
parents were divorced, lived at least part of the time with his mother 
in a higher-end neighborhood in suburban Highlands Ranch.
The
 Arapahoe shooting came a day before the one-year anniversary of the 
Newtown, Conn., attack in which a gunman killed 20 children and six 
adults at Sandy Hook Elementary School.