At 9:30 a.m. on Jan. 12, Danielle Redlick called 911, her voice shaking and broken, to report that her husband, Michael, 65, had suffered a “tragedy” in their upscale home in Winter Park, Florida. “He’s stiff, and he might have had a heart attack,” she told the dispatcher. But soon, the 45-year-old mother of two’s story changed: “We had an altercation, and he stabbed himself, and I ran into the bathroom,” she said, sniffling. “And I tried to help him, I saw him lying in blood.” When the dispatcher asked her to clarify what killed Michael—a heart attack or the...