CAIRO (AP) — Seif al-Islam Gadhafi, the son and one-time heir apparent of Libya ’s late dictator Moammar Gadhafi, was killed in the northern African country, Libyan officials said Tuesday. The 53-year-old was killed in the town Zintan, 136 kilometers (85 miles) southwest of the capital, Tripoli, according to two Libyan security officials in western Libya. The circumstances of his death were not immediately clear.