Testimony is underway in the second trial of man accused of killing a former roommate in northwest Iowa. Fifty-five-year-old John Green is charged with first-degree murder in the death of 58-year-old Mark Koster, who went missing in 2009 before his remains were found in the basement of his Sac City home in 2012.
Green’s first trial, held in Webster City, ended in a mistrial. This second trial is taking place in Boone.