TN+Theft+Scenario

Say John Doe has never been in trouble in his entire life, but one day he walks up to Jane Doe and puts a gun to her head. He then demands her to give him all of her money. Jane Doe hands him her purse, which has over $400 in it. Once he gets her purse he then hits her in the head and runs away.

What is the classification, grade, and punishment for this crime in your state?