Armando Hernandez on Friday pleaded guilty to two counts of attempted first-degree murder and two of aggravated assault with a deadly weapon.
Under a plea agreement, dozens of other counts were dismissed.
Hernandez faces 19 to 44 years in prison for the shootings of a 30-year-old woman, a 19-year-old man and a 16-year-old girl with a rifle at Westgate Entertainment District in Glendale.
All of the victims survived.
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