The mystery is over. Partly. Lottery officials on Monday announced that a South Carolina resident had stepped forward to claim the $1.5 billion Mega Millions jackpot from last October — the largest jackpot payout to a single winner in U.S. history — but elected to remain anonymous.

A 21-year-old man suspected of killing his parents and three other people was arrested Sunday when he drove up with a gun to his grandmother’s house in Virginia, a sheriff said. On Saturday, Dakota Theriot shot and killed three people — a young woman, her brother and her father — in Louisiana’s Livingston Parish before taking her father’s pickup truck,...