The Florida teenager obsessed with the Columbine school shooting killed herself before the FBI even learned that she had traveled to Colorado and launched a massive manhunt for her.

Sol Pais, 18, died of a self-inflicted gunshot wound on April 15 in the foothills west of Denver, according to the Clear Creek County coroner.

Authorities said she took her own life the same day she arrived in Denver from Miami.

The FBI has said it only learned the next day that Pais had traveled to Colorado and purchased a shotgun and ammunition.

Authorities launched a wide scale manhunt for the teenager and warned that she was armed and 'extremely dangerous' just days before the 20th anniversary of the deadly Columbine massacre.

The FBI said she had made threats to 'commit an act of violence' in Denver after becoming fixated on the 1999 shooting that left 13 people dead.

Sol Pais, 18, died of a self-inflicted gunshot wound on April 15 in the foothills west of Denver, according to the Clear Creek County coroner

Columbine and other schools tightened security and dozens closed entirely as authorities launched a wide-scale search for the teenager.

Police and the FBI were tipped off about Pais after the Miami Beach high school student made troubling remarks to others about her 'infatuation' with the 1999 bloodbath at Columbine High.

She purchased three one-way tickets to Denver on three consecutive days, then flew in on April 15 and went directly to a gun store to buy a shotgun.

Pais' body was found on April 17 off a trail near the Echo Lake Campground in Mt Evans - a recreation area about 60 miles southwest of Denver.

Investigators got a tip from the ride-share driver who took her there.

The driver reported the information to authorities on April 16 after investigators started their frantic search for Pais in the Denver area.

While authorities said Pais had not made a specific threat to an individual school, they said her fascination with the massacre and the gunmen and her recent actions had raised suspicions.

Pais' body was found on April 17 off a trail near the Echo Lake Campground in Mt Evans - a recreation area about 60 miles southwest of Denver

Columbine and other schools tightened security and dozens closed entirely as authorities launched a wide-scale search for the teenager after warning that she was extremely dangerous

Two teenage boys who attended Columbine High School shot and killed 12 classmates and a teacher on April 20, 1999 before committing suicide. At the time, it was the deadliest school shooting in U.S. history.

A disturbing website belonging to Pais, as well as posts on the National Gun Forum seeking advice on buying a shotgun in Colorado, emerged as the manhunt was underway.

While authorities said Pais had not made a specific threat to an individual school, they said her fascination with the massacre and the gunmen and her recent actions had raised suspicions

The FBI said they were looking at the website and other online activity as part of their investigation.

The website was filled with self-hate journal entries and contained a tribute to a Marilyn Manson song that was inspired by the high school shooting.

She was also behind a series of posts on the National Gun Forum website in March asking for advice on buying a gun in Colorado.

'Florida resident here. I am planning a trip to Colorado in the next month or so and wanna buy a shotgun while I'm there and I was wondering what restrictions apply for me? I've found a few private sellers I might want to purchase from; is it legal for me as a Florida resident to purchase a shotgun in Colorado? I'm 18 years old too, if it's important,' she wrote.

'The problem is I have no friends in FL who are into guns like me so it's not as fun having to do all of this alone,' she wrote in a follow up post.

Many questions still remained unanswered about Pais but a friend disputed the contention by authorities that she posed a threat.

In the days after her body was found, her friend Adrianna Pete painted a complex picture of Pais, saying she was deeply troubled, lonely and often talked about suicide but was also brilliant, kind and a talented artist who loved to draw.

A disturbing website belonging to Pais, as well as posts on the National Gun Forum seeking advice on buying a shotgun in Colorado, emerged as the manhunt was underway

Pete, 19, a college student in Carleton, Michigan, said she met Pais online two years ago through a mutual friend and quickly developed a friendship involving near-daily communication. They met in person twice, once when Pete traveled to Florida and once when Pais went to Michigan.

Pete faulted authorities for overreacting in portraying Pais as a threat based on her activities before her death.

'She never threatened anyone,' Pete said. 'There are no credible threats and only assumptions that she was just because the word Columbine was included.'

Pete said Pais had a weird obsession with the Columbine killers but that didn't mean she was planning an attack. The killers were 'someone she could relate to' because they were lonely, not because of their violence, Pete said.

'She would say I hate life, life sucks and that she was very alone,' Pete said. 'Then she told me she had it figured out with her parents before so I assumed like she was doing OK... She actually posted about it a lot, wanting to die.

'I believe she was just very mentally ill and had no one but me to confide in and a few people on the internet.'