If a co-tenant does not pay the rent on an apartment can the other tenant evict him?

When more than one person signed the lease each is responsible for the full amount of the rent if the other refuses to pay their share. The ability to evict the co-tenant who won't pay their share varies under different jurisdictions. In some cases only the landlord can evict a tenant. You should contact a landlord-tenant agency in your area or an attorney who specializes in tenant issues.