Outlaw's Redemption by Renee Ryan

Who would guess the most formidable adversary former gunslinger Hunter Mitchell ever faced would be a fiery, violet–eyed female? Now that he's served his time, Hunter intends to claim the daughter he's only just discovered. While the law is on his side this time, his daughter's devoted aunt certainly isn't.

Annabeth Silks can't bear to let a onetime outlaw take little Sarah. As the daughter of an infamous madam, she knows the hardship of an unstable home. But every glimpse of Hunter's reformed character dares Annabeth to look beyond his past...to the family and future she never thought to find.