A Middle Island baby allegedly injured by her mother's boyfriend has died.Authorities say 11-week-old Madeline Mendolia was pronounced dead at 10 p.m. Wednesday at Stony Brook University Medical Center. Police say Howard Brooks, of Port Jefferson, violently shook the baby, leaving her with internal head injuries. The girl's mother called police Sunday saying her daughter was having trouble breathing.Brooks has been charged with endangering the welfare of a child and reckless assault. An autopsy will be performed on the baby. Charges may be upgraded pending the findings.