Tranq, perhaps you should read the statute. Depending on when the death occurred even in California, it's not actionable:
Civil Code 1710.2:
No cause of action arises against an owner of real
property or his or her agent, or any agent of a transferee of real
property, for the failure to disclose to the transferee the
occurrence of an occupant's death upon the real property or the
manner of death where the death has occurred more than three years
prior to the date the transferee offers to purchase, lease, or rent
the real property, or that an occupant of that property was afflicted
with, or died from, Human T-Lymphotropic Virus Type
III/Lymphadenopathy-Associated Virus. As used in this section, "agent"
includes any person licensed pursuant to Part 1 (commencing with
Section 10000) of Division 4 of the Business and Professions Code. As
used in this section, "transferee" includes a purchaser, lessee, or
renter of real property.