as if everything that goes on here has this cod god above it. >> 33-year-old christopher mccowen was in barnstable superior court. the prosecution claiming mccowen's dna links him to the violence stabbing of fashion writer christa worthington. >> robert walsh is the lead prosecutor, and he's going to make an argument that they can prove beyond a reasonable doubt that chris mccowen raped and murdered christa worthington. >> please raise your right hand. do you solemnly swear the testimony you should give -- >> the first witness is tim arnold. he was the ex-boyfriend. he's the one who found her body. >> there was blood around her head. her knee was up in the air. >> were her legs together or spread apart, sir? >> somewhat spread apart. >> it's not just that she was stabbed to death. she was also horribly beaten, and there's bruises all over her body. >> the photos were very graphic. i think those photos helped us to get the reality of the crime scene, to get the reality of a murder was committed. >> the defendant was completely indifferent to her suffering, and that's based on the stat