NEW : The couple , who disappeared with their small sons , were killed , authorities say . NEW : Although investigators said someone had been researching travel to Mexico on the family 's home computer , the McStays ' sudden disappearance and the fact that their credit cards and bank accounts went unused raised suspicions . Remains were identified through dental records . Comment: Joseph and Summer McStay and their sons vanished in 2010 .
NEW : The couple , who disappeared with their small sons , were killed , authorities say . NEW : Remains were identified through dental records . Comment: Joseph and Summer McStay and their sons vanished in 2010 .