Person not on lease squating, how to get them to leave?

[Brent Wasson]

My friend is having a hard time with someone in his rental house. He has a lease with two tenants, they allowed a friend to move in without letting the landlord know. The two on the lease have since moved out but there friend refuses to leave. This person is disabled and not on the lease, how do I get them out of the house because they refuse to pay and are threatening to destroy the place.