Simultaneous Death, Generally
Simultaneous death occurs when two or more people die under circumstances that make it impossible to determine which of them survived, or outlived, the other.

When this occurs, all joint property with the right of survivorship is divided between the deceased owners and given to each owner's individual estate.  Each portion of the property is then controlled by each owner's individual will or, in the absence of a valid will, given to each owner's heirs according to the intestacy laws.

The same method is applied to any other type of property that has its ownership determined by which owner survives the other, such as joint bank accounts.  Also, if any decedent has life insurance payable to another of the decedents, the policy will be paid as though the insured decedent outlived the beneficiary.