(a) Policies on life of decedent.--Insurance proceeds payable to the slayer as the beneficiary or assignee of any policy or certificate of insurance on the life of the decedent, or as the survivor of a joint life policy, shall be paid to the estate of the decedent, unless the policy or certificate designates some person not claiming through the slayer as alternative beneficiary to him.
(b) Policies on life of slayer.--If the decedent is beneficiary or assignee of any policy or certificate of insurance on the life of the slayer, the proceeds shall be paid to the estate of the decedent upon the death of the slayer, unless the policy names some person other than the slayer or his estate as alternative beneficiary, or unless the slayer by naming a new beneficiary or assigning the policy performs an act which would have deprived the decedent of his interest in the policy if he had been living.