Rhode Island General Laws Title 33. Probate Practice and Procedure § 33-1.1-6. Joint tenancy

(a) One-half ( 1/2 ) of any property held by the slayer and the decedent as joint tenants, joint owners, or joint obligees shall pass upon the death of the decedent to his or her estate, and the other half shall pass to his or her estate upon the death of the slayer unless the slayer effects a separation or severance of the property or a decree granting partition.

(b) As to property held jointly by three (3) or more persons, including the slayer and the decedent, any enrichment which would have accrued to the slayer as a result of the death of the decedent shall pass to the estate of the decedent during the life or lives of the joint tenant or tenants (excluding the slayer). If the slayer shall not become the final survivor, then, upon the death of the slayer, such enrichment shall pass to the other surviving joint tenant or tenants. If the slayer becomes the final survivor, one-half ( 1/2 ) of the property shall immediately pass to the estate of the decedent, and the other half shall pass to his or her estate upon the death of the slayer, unless the slayer effects a separation or severance of the property or a decree granting partition.

(c) The provisions of this section shall not affect any enforceable agreement between the parties or any trust arising because a greater proportion of the property has been contributed by one party than by the other.