What's the most efficient way of determining who died recently in Arizona?

[Abdenour Achab]

I have been buying tax liens certificates in Arizona for several years, with the hope of acquiring one good property every couple of years at a very good price, with no success so far. 

For relatively large counties that list over 10,000 liens two weeks before the auction, by the time I have narrowed down the list, I have at most a couple of days left before the bidding deadline.

I suspect I would have more success if, let's say among the 100 properties I am considering, there was a way of determining which owners died recently. I did a Google search, but the methods I found were designed to find out whether some specific John Doe has died, and it seems like it would take more time than I have before the bidding deadline to determine who, among a list of 100 homeowners (or former, now dead, homeowners) is dead, and who is alive.

What's the most efficient way of determining who died recently in Arizona? Something that, if I had a 100 names, I could, within a couple of days, determine which one, two or three of them died recently. The method doesn't have to be fool proof. Let's say that, among the 100, 5 had actually died. If the method you suggest will help me figure out that ONE of the 5 had died recently, that would be great. The method doesn't have to lead to all 5.

Also, I don't want to rely on notices to administer the estate of so and so to determine who is dead. For those situations, there will be an estate administrator who is motivated to get close to market value for the house. I am interested in those who die without close relatives getting involved in selling the assets through probate.