Mildred Loving, a black woman whose anger over being banished from Virginia for marrying a white man led to a landmark Supreme Court ruling overturning state miscegenation laws, died on May 2 at her home in Central Point, Va. She was 68.

Peggy Fortune, her daughter, said the cause was pneumonia.

The Supreme Court ruling, in 1967, struck down the last group of segregation laws to remain on the books — those requiring separation of the races in marriage. The ruling was unanimous, its opinion written by Chief Justice Earl Warren, who in 1954 wrote the court’s opinion in Brown v. Board of Education, declaring segregated public schools unconstitutional.

In Loving v. Virginia, Warren wrote that miscegenation laws violated the Constitution’s equal protection clause. “We have consistently denied the constitutionality of measures which restrict the rights of citizens on account of race,” he said.

By their own widely reported accounts, Mrs. Loving and her husband, Richard, were in bed in their modest house in Central Point in the early morning of July 11, 1958, five weeks after their wedding, when the county sheriff and two deputies, acting on an anonymous tip, burst into their bedroom and shined flashlights in their eyes. A threatening voice demanded, “Who is this woman you’re sleeping with?”