The group is known as Trilogy, and it's a secret sorority at Penn State unaffected by sanctions and scrutiny after a February fraternity party turned deadly.

Some of the 100 women in that secret sorority were present at the frat party where 19-year-old Tim Piazza died after a night of hazing, forced to drink excessively and end up with a blood-alcohol level four times Pennsylvania's legal limit for driving.

The sophomore engineering student was trying to get around two of the Trilogy members when at about 10:45 p.m. he fell, head first, down the stairs.

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While Penn State administrators permanently banned the Beta Theta Pi fraternity, and a grand jury criminally charged 18 men in connection with Piazza's death, the secret sorority won't be subjected to the university's additional rules this fall, according to a report from The Daily Beast.

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That's because Penn State doesn't technically recognize Trilogy - a group that formed off the books in 2009 after the Delta Delta Delta sorority was banned because of alleged hazing and use of drugs and alcohol, according to The Daily Beast report.

The details surrounding the closure of Tri Delta have remained private, even as The Daily Beast reached out to former members and Penn State alumni.

But almost immediately after being shut down, 61 former Tri Delta members formed Trilogy in effort to help with THON, the two-day dance marathon that raises money to fight cancer, the report said.

While Penn State hasn't formally acknowledged Trilogy as a sorority, it still acknowledged the Greek partnership between Trilogy and Tri Delta's former frat partner, Kappa Delta Rho, when it came to THON, according to reports.

Read more of The Daily Beast story here.