A Kentucky inmate who was temporarily released from jail to be tested as a potential kidney donor for his ailing teenage son instead fled with his girlfriend to Mexico, prompting outrage on both sides of the border, officials said.

Nearly 100 people have offered to donate their own kidneys to 16-year-old Destin Perkins, who requires dialysis twice a week. Widespread media coverage has also given authorities renewed hope that they can capture the fugitive.

Byron Perkins, 37, has been missing since January when he failed to show up for the medical tests. He was released on $10,000 bond from jail, where he had been awaiting sentencing for marijuana distribution and unlawful transport of firearms. Perkins faced a minimum of 25 years in jail for the charges, which had been filed while he was serving a supervised release from a sentence in North Carolina for bank robbery.

Destin and his mother, who live a 2 1/2 -hour drive southeast of Louisville in tiny Russell Springs, have said they're disappointed in Perkins. Angela Hammond said it hurt that her son's father wouldn't try to come through.

''The whole thing has been a headache,'' she said. ''I want Destin better, first of all. That's the biggest thing.''

Perkins and his girlfriend have been placed on the U.S. Marshals Service list of the 15 most wanted fugitives, and authorities are offering a $25,000 reward for information leading to either of their arrests. His girlfriend, Lea Ann Howard, is wanted on felony drug and firearms charges.

U.S. Marshals have received dozens of tips on Perkins and Howard. While fugitives outside of the United States are normally harder to catch because marshals must rely on local police, Knighten said the case has generated interest in Mexico.