If they don't leave after the 3-day notice, you will be forced to take the tenant to court and file an unlawful detainer.

If he doesn't respond, file for unlawful detainer (or the equivalent for your jurisdiction).

If they don’t you will need to filed for a FED (forced entry detainer) and the sheriff will forcibly remove them if needed.

If you do not pay the amount owed no later than XXXX, I will file a Forcible Entry and Detainer.

The appropriate legal process is known as a "Wrongful Detainer"  We do them all the time.

If they dont communicate and pay them my attourney files the eviction and a forcable detainer the same day and I take them to court to force them out.

My husband lost his job, my renters stopped paying rent and I went trough an Unlawful Detainer to get them out just in time for my husband to ask me for a divorce and asked me to leave my residence of 18 years.

Arkansas provides causes of action (unlawful detainer comes to mind) that can have a tenant removed very quickly if handled by a skillful lawyer.

That's important because entering and preventing the for.mer owner from being able to return is often referred to as forcible detainer. 

The following matters are excluded from the requirement hereunder: (a) judicial or non-judicial foreclosure or other action or proceeding to enforce a deed of trust, mortgage, or installment land sale contract, (b) an unlawful detainer action, (c) the filing or enforcement of a mechanic's lien, and (d) any matter which is within the jurisdiction of a probate courtThanks!