Double Shot by Diane Mott Davidson

The governor of Colorado has commuted the prison sentence of Goldy Schulz's ultra-handsome, ultra-charming, ultra-wealthy, ultra-venal ex-husband, Dr. John Richard Korman, otherwise known to Goldy as the Jerk. He's released, and soon afterward Goldy becomes the victim of threats, rumors, and violence. Then there's a murder and suspicion centers on Goldy. Suddenly, she is faced with the challenge of running her successful catering business while fending off two persistent detectives. Caught in a web of secrets and lies that could tear her family apart, Goldy must use all of her considerable powers of detection to find the real killer before she herself becomes a target.