Vilger Louis, 56, says that when his 5-year-old daughter, Viloude, was born, seven weeks premature, she was tiny. "She weighed 1.75 pounds," he said Tuesday as he cupped his hands together, recalling how he held her moments after her birth. She spent several tense days at Miami Children's Hospital before she was able to join her family at home. "Now, it's this," Louis said somberly as he sat a few feet from Viloude's mother, Alourdes Desvallons, 39, who lay on their living room couch so consumed with grief that she barely moved. Jefferson Parish Sheriff's Office homicide investigators say Viloude...