EntertainmentBarbara Billingsley, best known as the “ever-sweet, ever-helpful suburban stay-at-home mom,” June Cleaver from Leave it to Beaver, passed away on Saturday in her home at the age of 94. A family spokesperson says that Billingsley died of polymyalgia, a rheumatoid disease. Her family says that she had been suffering from the illness and in poor health in recent years. Billingsley played the well-known June Cleaver from 1957-1963 (and of course in decades of reruns), and admitted 40 years later …