Since the Seth Gonzales case, the market in NSW has moved to full disclosure. The new RTA also has provisions for full disclosure from a LL to a prospective tenant.
The vast majority of tenants would not care. However, for the small number that might or do, care, then full disclosure is the way to go all the time now in NSW.
This even comes down to disclosing that you as a LL might want to sell the property during the period of the tenancy.
Although, 'material fact' disclosure relates to 'violent crime', and as such, a deceased estate in the normal course of events, would not be caught by the regulations, it also covers:
As material facts the following matters:
· if the premises has been subject to serious flooding or bushfire in the last 5 years;
· any significant health or safety risks associated with the premises and which are not reasonably apparent on inspection by tenant;
· if the premises has been the scene of a serious violent crime during the last 5 years;
· if the tenant is required to arrange and pay for rubbish collection;
· if the tenant will not be able to obtain a free residential parking permit
So, no longer is it "don't ask - don't tell" - it is tell all, up front.
As the OP stated, it was a natural death..not a violent one.
Disclosure is not required.
It will not help the situation to disclose this death.