Roommate wants to break lease in rental

[Bienes Raices]

My rental has three people (husband, wife, & their friend). The friend called me today and says he can't get along with them anymore and he wants to move out at the end of this month (they moved in in May on a one year lease).

Do I need to evict the whole group now or is there a way to work things out if the two remaining people can continue to pay the full rent amount? Also, how do I handle the security deposit in this situation? Thanks.