Need Eviction Advice

[Zach C.]

Hello All,

I live in Illinois and am having problems with a tenant  who has lived in a unit of a tri-plex of mine for just a month. I get multiple frantic calls from another tenant in the building at 0430 this morning saying upstairs there's shouting, sounds like things are being thrown etc. On my way to the property she then calls back to say strangers are in the house and one threatened to kill her. The cops were called, the strangers were already gone upon me and the cops arrivals. So, my question is how do I legally use this situation to evict? This is my first major problem with the tenant, but this is obviously unacceptable, I appreciate any advice.