LAHORE, Pakistan — The wife of a Pakistani man shot and killed by a U.S. official committed suicide by eating rat poison Sunday, explaining before she died that she was driven to act by fears the American would be freed without trial, a doctor said.

The U.S. has demanded Pakistani authorities release the American, saying he shot and killed two armed men in self-defense when they attempted to rob him as he drove his car in the eastern city of Lahore. He was arrested on Jan. 27, and the U.S. has said he has diplomatic immunity and is being illegally detained.

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