Legal Question in Landlord & Tenant Law in Illinois

On a "just because" basis, no. People have guests over all the time. The guest(s) who stole it are responsible. Only if your roommate knew or should have known the guests were not trustworthy or your roommate was otherwise negligent in some way might he or she be vicariously liable (ie. not directly but through some negligence of his or her own such as stated), and I don't know if that's something you want to accuse your roommate of. And because there was no forced entry I suspect you're saying the rental insurance won't cover the loss? Or do you have any insurance like that? If your roommate is not helping you, however, you should be filing a police report and that will involve your roommate's required participation because he will have to identify the "guests". If he is unable to vouch for them in any way, you may be able to establish his negligence.

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