Christopher Coates 
A Brother’s Obsession [EPUB ebook] 

Evan Brown is a disturbed man. For over a decade, the tragic death of his beloved sister has tormented him. His inability to save her has filled him with grief and guilt and is slowly driving him insane.
After a bizarre murder spree begins in Tucson, detectives Dan Felty and Mac Kenzie Bell begin investigating the case. They scramble to understand the killer’s motives and keep him from killing again. His victims appear to be chosen randomly, and the body count is rising rapidly.
As the detectives get closer to the killer, he lashes out, leaving one of them fighting for his life. But will a figure from the murderer’s past be the key to tracking him down… and can he be stopped?