Watertown Police have identified the 4-year-old girl who was killed after becoming entangled under a farm tractor this weekend.  Police say Ellie Kuslis was pronounced dead at the scene on Saturday at a family farm on Barnes Road.  The state’s chief medical examiner has ruled her death an accident due to blunt-force trauma.  The tractor was being operated by her father and stationary at the time, but Police say the slice seeder “remained engaged.”  The circumstances of the death remain under investigation by Watertown Police.  The state Department of Children and Families and OSHA have been notified.