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One of the victims from last week’s brutal slayings of four University of Idaho students called an unknown man seven times just before she was killed, her sister revealed.

Kaylee Goncalves, 21, called a man named Jack seven times the night she was slain, her sister Alivia told Inside Edition in an interview. Goncalves also tracked down the Uber driver who transported her late sister on the night she died. She also reviewed the security camera footage from her sister’s neighbor’s home to confirm when she entered her home that night, in addition to her sister’s call history.

“At 2:26 a.m. Kaylee starts to call Jack. Kaylee calls Jack six times between 2:26 a.m. to 2:44 a.m.,” Alivia Goncalves told the outlet. “From 2:44 to 2:52, Maddie calls Jack three times, then Kaylee makes a final call to him at 2:52 a.m. And they are both never heard from again.”

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Police mapped out the students’ movements before they were killed. Kaylee Goncalves and Madison Mogen were at the Corner Club in downtown Moscow, Idaho, from 10 p.m. to 1:30 a.m. At 1:40 a.m., they stopped at a food truck before coming home at 1:45 a.m.

Autopsies of the victims ruled the deaths of Goncalves, Ethan Chapin, 20, Xana Kernodle, 20, and Mogen, 21, as homicides and confirmed all four died by stabbing, according to a report released Thursday by Moscow Police.

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Law enforcement officers do not have any leads on a suspect, and they urge anyone with information to email or call the tip line at .