Tenant not paying last month - Eviction

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I am a landlord in Massachusetts and I'd like to serve an eviction notice to one of my tenants.

We have a signed 6 months lease that ends on Junes 1st but last month rent was not collected when the lease was signed. So, the tenant has decided not to pay the last rent and therefore, I'd like to serve them a court notice. This is an URGENT matter so please advise me on what I should do and what my options are.

Thank you!