Her Redeemed Hero by Terri A. Wilson

Washington Bender should have fought harder. He should have made better choices. Life is full of should-have’s, and living in the past is a waste of time. Until that past comes knocking at the door. As a US Marshal, Washington protects paranormal witnesses, but a call from his sister pulls him back to protect the pack he walked away from and face the woman he should have never left.
Axelle Michaels takes care of other people’s kids but struggles to take care of her brother. When he falls into a wrong crowd that includes the alpha of her pack, he makes a wrong turn that could get him killed. Now, she has to trust her first love to save her brother and her pack. Can she forgive him from walking away and turning his back on her when she needed him most?