Though he’s been retired 27 years, former homicide detective Joe Kenda still has nightmares. That’s part of the reason he agreed to host nine seasons of ID’s “Homicide Hunter: Lt. Joe Kenda.” It was a series that outlined most of the 356 cases he solved while he served with the Colorado Springs Police Department. Deep into his 21st year in homicide, Kenda says, “I wasn’t thinking about retiring but it jumped up and smacked me in the face. I was more concerned about my emotional state than I was about how I could fix it, but it finally dawned on me it’s time to do something else. … I miss the…