I am in the last month of my lease and already paid for this month. However, personal events have made it impossible to sign a new lease so I need to move out. Will my landlord keep my deposit?
You need to consult the lease. That is your contract with the landlord that stipulates exactly how the end of lease works. If it is not spelled out in the lease you will need to look at your local tenant laws, which will likely address any gray areas.
Be careful it may auto-convert to a month-month lease if you don't give timely notice.