Family members say a baby whose parents died in a murder-suicide amid a child-abuse investigation had a genetic disease that made her vulnerable to broken bones.
Jackie Cuin told the Rocky Mountain News in Friday's editions her granddaughter Alyssa O'Shell had spinal muscular atrophy, which prevents muscle development.
Cuin said Alyssa died Tuesday. The cause of death wasn't immediately available.
Commerce City police said that William O'Shell was under investigation for alleged child abuse involving his newborn, Alyssa. Their investigation began on June 17, when they said he and his wife took their daughter to a hospital.
Alyssa had multiple fractures, including a broken leg, police said. The child was removed from the home and placed with protective services while the investigation continued.
Police said the child abuse case was being built against William O'Shell, and they were getting close to presenting the case to the district attorney's office. Initially, they had four suspects, but had narrowed their list down to one: William O'Shell.
Police said they were close to arresting William O'Shell on child-abuse charges at the time of the shooting.