Something Borrowed, Something Black — Loren D. Estleman

Trying to go straight, former contract killer Peter Macklin carries out a hit in the Lone Star state, in this page-turning hard-boiled thriller
 
Johns Davis has just left the Alamo when he feels the garrote wrap around his neck. The bookie slams his foot on the gas, sending the car into oncoming traffic. It bounces off a van, hops the curb, and crashes into a hotel, knocking Davis unconscious and breaking the neck of his would-be assassin. Davis can breathe again, but just for a moment. When the mob wants you dead, they'll always send another killer.
 
The only man for the job is Peter Macklin, a veteran killer who's trying to put his old life behind him. He's just married Laurie, a beautiful, innocent young woman who believes her husband is a salesman. They're on their honeymoon in Los Angeles when he gets the call, and it's a gig he can't refuse. Macklin is going to Texas for a battle so tough it will make the Alamo look like a fair fight.
 
This spellbinding thriller from three-time-Shamus Awardâ€"winning author Loren D. Estleman takes hit man Peter Macklin out of his Motor City comfort zone and into the hot spots of San Antonio and Los Angeles.
 
Something Borrowed, Something Black is the 4th book in the Peter Macklin Thrillers, but you may enjoy reading the series in any order.