At Monday's hearing for 18 Penn State fraternity brothers accused in the death of Timothy Piazza, a police officer said that Piazza “looked like a corpse” in surveillance video from the night of his death. Piazza, 19, died Feb. 4, 2017 after a hazing ritual known as “the gauntlet” in which pledges were made to consume exorbitant amounts of alcohol.

Monday’s preliminary hearing aimed to determine whether there was enough evidence for the case against the fraternity members to continue to trial. Penn State police detective David Scicchitano discussed the disturbing surveillance video from the Beta Theta Pi fraternity house in which Piazza’s last moments were recorded.

Read: Timothy Piazza’s Death Was ‘Murder’ And ‘Torture,’ Family Says

“He looked dead,” said Scicchitano. “He looked like a corpse.”

The footage recorded Piazza falling down a flight of stairs at 11:22 p.m.

“He is unconscious,” said Scicchitano. “His eyes are closed. He is limp. He is dead weight.”

Piazza was then left alone on the couch where he remained at about 3 a.m., said Scicchitano. He then went on to fall a number of times, hitting his head and stomach. Piazza did not appear on camera again until two hours later when fraternity brothers found him in the basement of the house, NBC Philadelphia reported. The brothers then carried him to a couch upstairs where they left him.

“To know that he was lying at the bottom of the basement steps for any length of time at all by himself,” his mother said. “It all is terrible.”

In original testimony heard in May, it emerged that despite Piazza’s clearly deteriorated condition, fraternity brothers did not call 911 until 12 hours after he originally fell down a flight of stairs. Instead of getting help, surveillance video captured some of the members slapping him and pouring liquid on him in an attempt to rouse him as he went in and out of consciousness throughout the night.

Though Piazza’s death was ruled accidental, 18 brothers were charged in connection. Eight faced felony charges that could carry up to 20 years in prison. The fraternity chapter was also a defendant in the case.

“This wasn’t boys being boys,” Piazza’s father told CBS News in May. “This was the murder of our son. They tortured him for 12 hours. They let him suffer for 12 hours. He died a slow and painful death at the hands of these ‘men of principle,’ as they call it.”

Piazza’s father also said the decision to wait to call for help cost his son his life. When the family asked their son’s doctor if he would have lived had he been brought in earlier, the doctor said yes.

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“To hit him and slap him and brutalize him, they should not have been trying to get a response,” Piazza’s brother, Mike, told CBS News. “They should have been trying to get him help.”

In reference to the charges against the fraternity brothers, Piazza’s father said he would be “good with 20 years.”

“They killed him,” he said. “They fed him lethal doses of alcohol and they killed him.”