Transcript for Penn State frat brother may have deleted video
Want to move to that new bombshell in the Penn state hazing case as the fraternity brothers head back to trial and crucial video athat may have been deleted and ABC's gio Benitez is covering the case for us in state college, Pennsylvania. Hi, there gio. Reporter: Hey there, Paula. Good morning to you. The prosecutor tells me if that video was deleted intentionally then that means it may show something far worse than they've already seen, the FBI is now trying to retrieve it. This morning, a sea of blue blazers descending upon this Pennsylvania courthouse. 18 former Penn state fraternity members facing charges in the February death of 19-year-old beta theta pi pledge Tim piazza. We have a friend who is unconscious, hasn't moved. Probably needs an ambulance. Reporter: Bombshell testimony. The lead detective saying he believes that two days after piazza's death, a frat brother intentionally deleted video from a camera in the basement where piazza laid unconscious after falling head first down the stairs after a night of heavy drinking. Prosecutors telling ABC news that surveillance device is now in the hands of the FBI. Revelation is a staggering and stunning development. Reporter: Piazza's parents sitting in court crying as defense attorneys lined up to cross-examine the detective all attempting to diminish the students' roles and questioning the university's responsibility. We heard evidence that checkers were there that evening and they didn't find any violation. We have a resident adviser who lived in the house. He could have shut the whole party down. Reporter: As students returned to campus next week questions about what Penn state is doing to make fraternities safer. The school now limiting the number of frat parties with alcohol from 45 to 10 per semester. Beer and wine only served by state certified bartenders and banning kegs. How does this affect fraternity culture across the country? Well, I hope that schools are looking at it closely and I hope that the national level is looking at it and wondering are we next and we need to start taking steps right now. Reporter: And typically over the next few weeks students would be on campus pledging for a frat. But that so-called rush week has now been postponed till spring. Paula. Yeah, definitely opened up important conversations but excruciating for those parent, gio, thanks for your reporting.
This transcript has been automatically generated and may not be 100% accurate.