s to change. they're legal only for emergency vehicles. all right, well, that explains how he's getting through traffic then. disrupting lights should leave a record in the system, times and places. there's cameras all over los angeles, on buildings, and intersections, at atm machines. okay, so we can check the locations and the times against the web cam logs. use them to get a photo. what do you think are the chances of that though? more cameras, better odds. what do you say guys? hey, all right, so here's what we got. we been through hundreds of web cams at intersections indicated by charlie's analysis of traffic light disruptions. we got this. traffic web cam from la brea and the 10 freeway, at 15 minutes after attack no. 9. three seconds before he drove through that light, it was hit with an infrared pulse. no license visible. no way to identify the truck or the driver. and this, what's this? uh, that's some sort of decal. pulling together a lot of string. that the crossing guard witness saw the killer-- that the guy in this photo is the one who changed the light.

well, maybe you're right. maybe that's our guy.

tech: we're getting something. i'll flip it around and print it out. does that say h-t-s-u. head trauma survivors united. yeah? yeah. brennon sommers, the guy we suspected. i think he's part of their northridge chapter. there's something on the bottom of the decal that's not quite legible. well, it could be northridge. now that would not be random chance. so far we have eight current and former members that we can link to freeway attack victims. two have white pick-ups. one's a 74-year-old lady. the other is mitchell mackenzie, 38, he's a home contractor. mackenzie was in a motorcycle accident a year ago. he suffered a head trauma. two months after he joined the support group, the freeway attacks started. well, that must be it, right? that must be how he's choosing, is through the support group. his accident was a hit-and-run. so he's got no target for all the rage. he could be acting on behalf of the other victims. that's not the kind of support anybody expected. mitchell's close to many people in the group. it's common for trauma victims to feel like nobody understands

what they've been through except other victims. dr. brewer, do you discuss the freeway attacks in your group? it's come up in meetings. i remember i made a note about it. what was your note? mitchell talks a lot at meetings, has an opinion on everything. but on the topic of the freeway attacks, he's been quiet. thank you. excuse me. eppes. don, i think mackenzie could be the guy. we just got a hit on his credit card. a gas station in long beach. so i got david colby and lapd on their way. (siren approaching)

come on, man. (grunting) (sirens blaring) (tires screeching) come on! (tires screeching) (tires screeching) get out of the way! get the hell out of the way! get your hands on the wheel! mackenzie: don't shoot! just wait! hands on the wheel right now! out the car! against the car! i'm only trying to do what's right! innocent people hurt and killed! and those responsible just walk away! somebody has to pay. that's all i do. i make things right.

i make things right. what are you sitting in the dark for? just thinking. thank god you caught that guy, huh? five deaths, six people injured. and tomorrow i got 12 new cases. hey, you had a lot of tough ones lately. maybe you should think of taking some time off. yeah, don't i wish. donny, it's not good for you to get this way. ah, dad, what are you talking about? this is the way i am. no, no, listen to me, donny... look, it's just, you know, sometimes... (door opening) hello. hey, don, glad you're here. i found something interesting that i want you to look at. oh, yeah, what's that?

you know how i thought that all the freeway attacks were a random series? don: yeah. they weren't. they weren't. because, yeah, mackenzie was behind all of them, but he didn't actually start the sequence. what are you talking about? a hit-and-run driver started the sequence when he hit mackenzie. the head injury that mackenzie sustained left him unable to control his impulses, control his rage... alan: oh, come on, charlie, the man is still responsible for his actions. yeah, of course. except that the guy that hit mackenzie was never apprehended. he totally got away with it. is this his accident report? yeah. megan called the chp for me, and i thought it was something you might want to look at. yeah, i think i see where you're headed. what? the guy's tire treads, paint and metal. yeah, there's tons of information. i can help you with this. yeah, yeah, yeah. yeah, charlie, this is good. charlie: yeah, this is... there's enough information. you got a pen? yeah. we can narrow down the suspect list. definitely, definitely. captioning sponsored by cbs paramount network television and brought to you by toyota. moving forward.

choose any direction as long as it's moving forward. captioned by media access group at wgbh access.wgbh.org

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