I will call the police today.  

@Huiping ShengEverything depends on your insurance policy, what it covers, and for what $ amount.Your insurance policy will state if it covers putting a tenant up in a hotel when there is damage to the property.Insurance polices will state if they cover hurricane or wind damage or flood.

If I hire a GC, I'm paying them to get a job done and handle the details for me, I don't want to know the details and problems.How you fire him will depend on your contract, but likely he has breached a term of the contract and therefore you are terminating it, effective immediately, and will notify the local police department that he is not to step foot on the property except to retrieve his tools within 24hrs.

The neighbor saw it as well.Every day I walk up the stairs, it smells like marijuana coming from their room.Can I evict them for this or do I need to call the police?

If he keeps up with vaguely threatening language I guess I could have a lawyer review it or simply present it to the police.

However, she is "refusing" to allow me to show the property to a potential tenant when she is not there and is threatening to notify the police if I attempt to show her unit. 

I was told that people in the community called police reporting him many times but police never cares...

Was a police report filed?  

He won't call the police himself because he's afraid they'll mention his name.How would you recommend me handle this?

Today, it is the mecca of crack and meth and they are putting a police substation in the center of it it's so bad.