killer were slim to none >> memories fade, evidence has to be relocated, so it's obviously uphill battle, what you're working with. >> reporter: doesn't begin to describe it. cold case file that he opened that bleary eyed monday morning would lead him on chase of a lifetime and shake the foundations of the lapd. dates back to 1986 and battle for truth by parents of a young bride. >> we miss her every day. >> nils and loretta rasmussen. >> doesn't make a difference what day it is, it's a pain always there, no cure for it >> reporter: who would want to kill sheri rasmussen she was hardworking, popular with friends and coworkers, a nurse at local hospital.