PHOENIX — Two teenagers have been sentenced in the carjacking and death of a fellow Hopi tribal member who was stabbed 31 times.

A federal judge in Phoenix on Monday sentenced 18-year-old Arianna Soohafyah (sue-HEFF’-vayah) to 20 years and 17-year-old Camille Lomaomvaya (loh-MAH’-ohm-vayah) to 16 years in prison.

Federal prosecutors say the teens had forced their way into Florine Talayumptewa’s (tuh-lie-YUM’-ti-wuh’s) home in Second Mesa on the Hopi reservation. They say one held Talayumptewa at knifepoint before the other took the knife and repeatedly stabbed her in 2016.

Soohafyah previously pleaded guilty to conspiracy to commit murder. Lomaomvaya pleaded guilty to carjacking resulting in death.

Court documents say the two had planned the attack for months to steal Talayumptewa’s 2014 Dodge Avenger.