sherri rasmussen had been murdered in los angeles back in the 1980s. arents told investigators about several run-ins sherri had with her husband's ex. now decades later, a cold case detective was focusing his attention on that very same woman who also happened to be a member of the lapd. here's josh mankowitz with more of "the smoking gun." >>> for two decades, the lapd had but one narrative for sherri rasmussen's murders -- she was randomly killed by two men during a botched burglary. now science had rewritten the script, and this once cold case was suddenly almost too hot to handle. the prime suspect, an lapd detectives named stephanie lazarus. but as detective jim nutall went back through the original murder book, he found almost nothing on lazarus even though she was the ex-girlfriend of sherri's husband. no indication she was ever spoken to? >> no. >> there was just one notation in the official chronology of the investigation from back in 1986. a detective had written, stephanie lazarus, p.o., police officer. as if her name had come up but not as a