(a) Joint ownership by slayer and decedent.¹--One-half 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 estate, and the other half shall pass to his estate upon the death of the slayer, unless the slayer obtains a separation or severance of the property or a decree granting partition.

(b) Joint ownership by three or more persons.--As to property held jointly by three 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. If the slayer becomes the final survivor, one-half of the property shall immediately pass to the estate of the decedent and the other half shall pass to his estate upon the death of the slayer, unless the slayer obtains a separation or severance of the property or a decree granting partition.

(c) Enforceable agreements unaffected.--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.