BOYNTON BEACH — A woman who lived with her ex-partner on the city's south side stabbed her former lover more than 200 times with a Phillips-head screwdriver and then tried to conceal the killing, police said. After committing the crime, Carol Anne Burger, 57, a writer who friends described as engaged and eager to move on with life, reported her old flame missing and then, a day later, shot herself to death in her backyard, police said.