How to find a ghost Owner

[Tee Allen]

I am in the process of trying to locate an owner of a property and something is telling me not to give up on this one but I have ran out of resources to locate him and was wondering if any one had any ideas as I am willing to do what ever it takes to track him down 

I've  had talked to the neighbors and found out property has been vacant quite sometime

Done searches on the property to see if any other person has lived at the property to see if the owner was a landlord and nope just him since he purchased the property back in 09

Went to the assessors office to see just maybe he has a different address on file but nope just the property is his address they have for him

Tried white pages called every single number listed for him & even Facebook

The guy at the assessors office told me he might just be deceased because he is also behind on taxes..

Any advice i would gladly appreciate 

Thanks