He shared an Emmy for his reporting on “Nightline” about South Africa’s policy of racial segregation. The National Association of Black Journalists named him journalist of the year.

Kenneth Walker, an Emmy Award-winning journalist whose reporting for the ABC News program “Nightline” helped bring the brutality of South Africa’s racist apartheid system to the attention of the American public, propelling it onto the agenda of U.S. policymakers, died on April 11 in Washington. He was 73.

His cousin and executor, Jeff Brown, said his death, in a hospital, was caused by a heart attack, It was not widely reported at the time.

Mr. Walker’s weeklong coverage of South Africa’s often brutal policy of racial segregation — produced for “Nightline” with Ted Koppel, the program’s anchor, and a team of reporters — won a 1985 Emmy Award from the National Academy of Television Arts and Sciences for outstanding analysis of a news story. It

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