Killer On The Homestead by Nicole Helm

He has to help her find a killer before they both become targets...

After a career-ending injury, Duncan Kirk leaves baseball behind and heads back home to Wyoming. Instead of finding a safe place to retreat, he discovers that cattle are disappearing from the family ranch. Enter private investigator Rosalie Young...Duncan remembers her as a girl with skinned knees and a reckless attitude. Now she’s a grown woman, sharp as a tack, and gorgeous as hell. When the Kirk family become suspects in a murder, everything changes. Can Duncan and Rosalie protect each other long enough to uncover the truth?