Tenant has no electricity and house smells

[Sam Abe]

I just heard from my neighbors that the tenant has no electricity and is having some issues with power company so he is living without electricity and is also planning to move out. Additionally there is an awful smell as he left some chicken in the fridge which has mad a stinking smell thorough out the house and even into the walls. 

I have never inspected this unit how should I handle this as I just heard about it from someone. Is there anything I need to do before he gives me a notice so I have proof or can hold him responsible if thats possible.