The 13-year-old case of a missing Baltimore County doctor was solved Tuesday, with a surprise murder confession announced in a federal courtroom nearly a thousand miles away, The Sun's Tricia Bishop reports.

Dr. Henry Peter Ackerman was a 48-year-old widower and recent transplant to the Baltimore area when he went missing in the summer of 1998 during a trip to Memphis, Tenn. He and his wife, Velma, had lived in a suburb there before her death from leukemia in 1994, and Ackerman went back to the area planning to buy a vehicle and drive it to his new home in Maryland, federal prosecutors said.

But he never returned, and more than a decade would pass before anyone looked to Dale Mardis, a gun dealer, for answers.

Mardis, 57, was convicted earlier this year in federal court in Tennessee in the racially motivated killing of an African-American code enforcement officer named Mickey Wright in 2001. Mardis shot Wright, dismembered the body with a Becker BK-1 Brute survival knife, burned it and spread the remains in junk cars that were later crushed, according to court documents and news accounts