Don Oliver, a correspondent for NBC News for more than 25 years, died Tuesday in Spokane. He was 76.

The cause was complications of Lewy body dementia, his wife, the former Shirley Humphrey, said.

Mr. Oliver worked for NBC Nightly News from the mid-1960s until 1992. As a national correspondent, he covered the civil-rights movement and nearly a generation’s worth of political campaigns.

Mr. Oliver went abroad to report on conflicts in Laos, Cambodia and Vietnam; the Middle East peace talks in 1977; and the Civil War in El Salvador.

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In the 1980s he focused on environmental issues, notably the Exxon Valdez oil spill.

Donald Lynn Oliver was born on July 14, 1936, in Billings, Mont. He earned a bachelor’s degree from the University of Montana’s School of Journalism and a master’s from Columbia University. He worked for local television stations until NBC made him its Midwest correspondent.

After he retired from NBC he worked as a media consultant and taught journalism at the University of Montana.