The food waste ruins them.

Move now or get evicted and get your credit ruined and an eviction on your record - both of which will pretty much ruin his ability to find a decent rental in the future.And print out this article to hand to him, too:http://homeguides.sfgate.com/apartment-eviction-me...I'd tell him he needs to be out by a certain date (maybe a week?)

Only 2 of the three bedrooms went relatively untouched.When I walked through the place 19 months later, the laminate floors have burn marks; the bathroom door has holes in it; one of the bedroom doors was ripped from the door casing; the kitchen counter is ruined; the new appliances are ruined; doors on the kitchen cabinets are ripped off.  

That stuff stinks and it ruins a house.

My old single pane windows were completely ruined so i approached Landmark home solutions near my home in Toronto for replacing them.

Having it in writing will likely save you from a lot of in person sob stories about how their credit was ruined or similar situations.

I am trying to evict him because I don't want bad thing happen like fall from stairs or even he die at property (because he got cancer)My questions are:Is the eviction right thing to do?

They can include a judgment in their bankruptcy, but they can never get rid of an eviction in a database used to report evictions on an eviction report.So, they may get the last laugh in free rent, but you can get the last laugh regarding ruining their ability to rent from any reputable landlord forever.And, why the HELL did your manager rent to these people? 

I have had plenty of new cars before, that I bought new, but financing a depreciating object - I won't even call a car an asset - is the easy road to financial ruin. 

Your only real leverage with any tenant to behave, is the threat of kicking them out, and ruining their credit.I did not accept co-signers, because especially with students, then you are dealing with a helicopter parent.