The Florida teen who bought a shotgun on a “pilgrimage” to Columbine — sparking a massive manhunt — was found dead Wednesday in Colorado of an apparent suicide, officials said.

Investigators found the body of Sol Pais, 18, around 10:30 a.m. Wednesday near the Echo Lake Lodge in Clear Creek County — about 30 miles from Columbine HS — and officials believe she used a pump-action shotgun she bought shortly after arriving in Denver to kill herself.

“At this point, it looks as if she was alone and took her life with the weapon she procured,” Dean Phillips, FBI special agent in charge of the Denver field office, said at a press conference on Wednesday.

The discovery ended a nearly 24-hour manhunt for the high-school student after she flew Monday to Denver and made “credible” threats.

“Because of her comments and her actions, because of her travel here to the state, because of her procurement of a weapon immediately upon arriving here, we considered her to be a credible threat — certainly to the community and potentially to schools,” Phillips said.

The teen booked three one-way, Denver-bound flights for successive days, then boarded the first, which was on Monday, officials said.

Upon arrival, Pais used a ride-sharing app to get around and “went directly to the store” to legally buy a pump-action shotgun and ammunition, Phillips said. The purchase was made at a Littleton gun shop not far from the Columbine campus, where 13 innocent people were killed and 24 wounded in the infamous school shooting carried out by two students 20 years ago this month, authorities said.

As officials pursued the teen, more than 20 schools, including Columbine, were closed Tuesday and into Wednesday as a precaution.

The teen was last seen alive — wearing a black T-shirt, camouflage pants and black boots — when a ride-share vehicle dropped her off Monday near the Jefferson County foothills outside of Denver, officials said.

“The driver did help us pinpoint the last known location,” Phillips said.

Authorities in Miami flagged the case to the FBI early Tuesday, which triggered the manhunt. Officials still have not revealed what specific threats Pais made or why the high-schooler first appeared on Miami authorities’ radar. “We had no specific information on a targeted school. It was generalized information, and we were concerned about any particular school,” Phillips said.

Jefferson County officials in Colorado said threats to public schools in the area were not uncommon — but this one stood out. “We are used to threats, frankly, at Columbine. This one felt different,” said John McDonald, executive director of safety at Jefferson County Schools.

Authorities also cited “troubling” statements she made to friends and family, as well as posts she made online.

The FBI wouldn’t say whether Pais was behind a deranged online journal written under the alias “Dissolved Girl” — but Phillips confirmed “it is part of what we’re looking at.”

Investigators “are trying to follow every lead, assess every social-media outlet, to assess everything she might’ve done over the last few months,” Phillips said.

Pais’ family reported her missing Monday night and said she may have been suffering from mental-health issues.

With Post Wires