Avila was convicted April 28 after a jury deliberated for nine hours. The jury later recommended the death penalty, which was officially imposed Friday.
"You don't deserve a place in my family's history," Samantha's mother told Avila before his sentencing. "I want you to disappear into the abyss of a lifetime in prison where no one will remember you, no one will pray for you and no one will care when you die."
Avila will join 644 others on California's death row. Donald Beardslee was the last person executed in California in January, after spending 20 years and 10 months on death row.