Another death occurred on Walt Disney World property Sunday, TMZ has learned ... and this marks the fourth one in a month. Florida's Orange County Sheriff's Office tells TMZ ... "A woman in her 40s was transported to Celebration Hospital where she passed away." We're told there were no signs of foul play. As we reported ... there were three previous deaths at Walt Disney World over the last month -- two of which were apparent suicides. A 31-year-old woman died by suicide at Disney's