Couch, 32, has evaded capture since Saturday, after he allegedly used an AR-15 to shoot at unsuspecting drivers on Interstate 75, near London, Kentucky, according to the FBI.
The children were between 13 and 18 years old, and were recovered in Cleveland and Akron, Ohio. One victim was found in Washington state.
Police in Beaverton, Oregon, announced the discovery of 32-year-old Melissa Jubane's remains Saturday, after family first reported her missing three days prior.
The ex-boyfriend of Rebecca Cheptegei was also taken to the hospital with burns on more than 40% of his body, which later caused him to develop respiratory failure and sepsis.
