The Beta Theta Pi fraternity and 18 fraternity brothers at Penn State University are facing hundreds of charges related to the hazing death of sophomore Timothy Piazza.

Piazza, 19, died of his injuries after falling down the stairs in February at a pledge acceptance ceremony, CBS News reported at the time. Police attributed the fall to excessive drinking in which he partook as a result of hazing rituals for students pledging the fraternity. They noted that no one called for help until the morning after the fall.

Investigators have subsequently been able to piece together what they say happened the night of Piazzas death, drawing largely on surveillance footage, witness testimony and phone records, ABC News reports.

On Friday, Centre County District Attorney issued a comprehensive report announcing charges against the fraternity and its brothers and releasing new details about what allegedly happened.

Combined, the organization and 18 members are facing more than 850 charges , Buzzfeed News reports. The allegations range from involuntary manslaughter and aggravated assault to charges stemming from underage drinking and trying to cover up evidence.