Removing a Tenant From a Lease

[Erin Horn]

I am a first time landlord and have four girls renting a space from me.  They are having roommate issues and want one of them to move out.  I actually also would rather have her gone since I have been told she's been doing drugs in the apartment (even though I don't have any actual proof).  I'm going to let her move out and have a replacement move in, but I want a whole new lease signed with the remaining people.  Should I have the girl moving out sign anything to say she is released from the lease?