side. and i grabbed it and i grabbed my firearm and i shot him one time. in multiple recorded interviews zimmerman never tells police that trayvon martin ever touched his gun. dna testing seems to agree, there was no trace of trayvon mart martin s dna on the gun s grip. cutors list ossterman s book with zimmerman s conflicting account as potential evidence possibly to challenge zimmerman s credibility. as for his connection to the gun zimmerman was carrying, osterman says it s hard to answer the question, does he feel regret. he didn t have it to go out and commit a crime of hunting someone down and harming them, it was for self-protection. and i m glad that that firearm was used to protect george. reporter: mark osterman could appear as a witness for the prosecution and for the defense. as far as what he has to tell them, osterman says he sees no difference in a case of
holy [bleep]. reporter: john good made that 911 call the night george zimmerman shot and killed 17-year-old trayvon martin. on day five of the second degree murder trial, prosecutors used good s testimony and original stick figure sketch for police to challenge zimmerman s claim that martin repeatedly pounded his skull into the sidewalk and suggested his use of deadly force was not justified. did you ever see the person on top slamming the person on the bottom s head on the concrete over and over and over? no. did you see at any time the person on top grab the person on the bottom s head, slam it into the concrete. no. reporter: on cross examination, zimmerman s attorney scored getting him to identify martin as the one on top and identify the person yelling for help. you now believe that was george zimmerman s voice. tell us if you think that was george zimmerman s voice screaming for help, the person on the bottom. that s just my opinion.
reporter: also on the stand today, a neighbor that took the first photo of zimmerman s injuries, minutes after the shooting. he described zimmerman as calm and matter of fact. these [bleep], they always get away. those were the words in that grown man s mouth. reporter: in a forceful hoping statement monday, prosecutor john guy unloaded f bombs before the all woman jury. while the defense attorney, don west, began with a knock knock joke that bombed. george zimmerman. george zimmerman who? all right, good, you re on the jury. reporter: by far, the most memorable witness of the first week of testimony, 19-year-old rachel jeantel, she was on the phone with martin as he walked home from 7-eleven. she rolled her eyes, often hostile during cross examination, considered the state s star witness, she s the only person to say zimmerman was
tunnel vision. he was able to smack the hand away from the firearm, and that s when he drew the firearm and fired. reporter: osterman wrote about it in a book, quoting zimmerman somehow, i broke his grip on the gun where the guy grabbed it between the rear site and the hammer. i got the gun in my hand, raised it toward the guy s chest and pulled the trigger. and this is where the problem lies for george zimmerman, because comments quoted by his friend, osterman, do not match what zimmerman told police. listen to what he says as he walks investigators through the crime scene. and he reached for it, but he reached like, i felt his arm going down to my side, and i grabbed it and i just grabbed my firearm and i shot him one time. reporter: in multiple recorded interviews, zimmerman never tells police that trayvon martin ever touched his gun. and i saw him take one hand off my mouth and slide it down my chest, and i just pinched his
arm and i grabbed my gun and i aimed it at him and fired one shot. reporter: dna testing seems to agree. there was no trace of trayvon martin s dna on the gun s grip. prosecutors list osterman s book with zimmerman s conflicting account as potential evidence, possibly to challenge zimmerman s credibility. as for his connection to the gun zimmerman was carrying, osterman says it s hard to answer the question does he feel regret. so, i would wish it would have never happened. however, the reason why george had it, it was not for malice. he didn t have it to go out and commit a crime of hunting someone down and harming them. it was for self protection. and i m glad that that firearm was used to protect george. and now david, so, if he really is george zimmerman s best friend, how does mark feel about, at this point, you re