By this point, you might think Joe Kenda would be tired of recounting the gory details of the murders he investigated for 23 years as a Colorado Springs Police officer. That would mean you’ve never seen “Homicide Hunter,” the Investigation Discovery series that puts the retired, 72-year-old Kenda at the center of a different case each week. Starting in 2011 and continuing for 124 episodes and eight seasons, the true-crime series has portrayed Kenda’s career through interviews and reenactments, all based on events that happened in or around Colorado Springs. “I’ve never seen murder change,” Kenda said during a break from filming promotional spots in downtown Denver last month.