If you are looking to continue to lease your apartment but your roommate needs to move away here is the process:
You will need to ask your landlord for permission through your Property Manager. Your landlord has the right to deny a roommate change. Some landlords limit the amount of roommate changes per unit and some do not allow them at all. This is always on a case by case basis.
A few additional things to note.
When you are ready to inquire with your Property Manager about this process, please allow them at least 30 days to complete this change. It is in direct violation of your lease to have someone move in without first being approved and added to the lease. Also the prior roommate that moved out would still be responsible for the property. Subleasing is not permitted without authorization from the owner.
****This information is deemed reliable but not guaranteed****