In their testimony, they described the changes they witnessed in Dominguez about a year after he started college and the months leading up to the murders.
Reales Campos said his son stopped talking to his siblings and his parents the year before the stabbings.
Dominguez's parents apparently asked him not to return to school for that second year, as they were worried about his health.
"He was skinnier. He wouldn't take care of himself, and when we would watch movies, he would just stare into the walls," the sister said.
"It would typically be we would be walking around, things like that, we would pass a group of people and he would say something under his breath," Gallardo said. "At first, I thought he was talking to me."
Gallardo is expected to continue testifying on Tuesday. Dominguez is facing two counts of murder and one count of attempted murder. Prosecutors are not seeking the death penalty.
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