Identical Twin Sisters found dead

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I just read of a case of two identical twin sisters who were found dead at the age if 73 in the house they lived in together in South Tahoe, CA. They often say identical twins have a sort of mysterious tie between them. These women were inseparable and never married. When they were younger, they once sang and entertained troops in USO shows that Bing Crosby put on. Yet, later in life they became very reclusive and shunned the contact of neighbors and even childhood friends. Autopsies still need to be performed but there was no evidence of foul play in their deaths. I know of a case where the parents of someone I went to college with died within a few days of each other. In this case, the father was sickly, but the mother died first and the father died a few days later. The case of these twins dying though makes one wonder is there is a mysterious bond between identical twins or at least some identical twins. Have you ever known any identical twins. Have you ever heard of any cases of twin being so attached as these two were?