Overnight, distraught family and friends came together for a vigil for Arizona State University freshman Jack Culolias, who has been missing since Friday night.
"I don't know what to do," said Grace Culolias, Jake's mother.
Grace Culolias, of Brea, is desperate for answers and willing to do anything to find her 19-year-old son, who was last seen at a bar called Cadillac Ranch in Tempe Marketplace. Jake, who was said to be very intoxicated, was allegedly kicked out of the bar and left his cellphone and credit cards behind.
Nick Culolias is extremely concerned for his brother's welfare and says Jake's disappearance is completely out of character.
"He normally would never do anything like this. We always know where he's at," he said.
The missing student had been at a social event Friday night for fraternity Sigma Alpha Epsilon as a new pledge. The pledging process is something his mother says he was concerned about.
"There was a rumor that they were gonna put them in a garage, 30 of them, and make them live in this garage," Grace Culolias said.
In a statement to ABC News, the fraternity said Sigma Alpha Epsilon "takes a very strong stance on hazing and has zero tolerance for it."
His mother reported him missing to Arizona police before searching for him herself with family and friends. What she found in the riverbed behind a nearby shopping center is likely the most significant clue found yet.
"I got alarmed the moment I saw the shoe," Grace Culolias said. "I washed his tennis shoes on Thanksgiving, so I know what they look like."
Police have few clues and haven't yet confirmed that the shoe officially belongs to the missing victim. Authorities said they had boats patrolling the area looking for him but to no avail yet.
"I'm just scared," Grace Culolias said. "He's my youngest son."
Brea Police say they have not been contacted by any outside agencies and have not begun an investigation.
Anyone with information regarding this case was urged to contact Arizona State University police at (480) 695-6456.