DAVENPORT — After his arrest, a Manchester man accused of killing Michelle Martinko ignored questions from a Cedar Rapids police investigator as to what happened when the 18-year-old was stabbed 29 times and bled to death in her parents’ Buick on Dec. 19, 1979.Jerry Burns, now 66, in a car ride from Manchester to the Cedar Rapids Police Department after his arrest in 2018, seemed to change the subject when investigator Matthew Denlinger asked, “What happened that night?”A video from the squad car shows Burns, who was handcuffed and sitting in the back seat next to Denlinger, at first seemed to ignore him and then started talking about his cousin, Brian Burns, 55, who had a disability and went missing Dec.