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Shooting. for more on these unfolding developments. let's bring in cnn's miguel marquez. what more are we learning about the suspect and the possible motives and what's happening there now? >> what may be absolutely disturbing about this, fredericka, is that this person that everyone at cnn has talked to and everyone that i've seen in other are reports saying he was a friendly guy, a quiet guy, an okay guy and then this. you talked about the resignation earlier in the day. his immediate supervisor is one that was killed. it's not clear if he targeted that individual. police have spoken about h...

From probable cause documents, we learned he confessed to the crimes and later law enforcement giving us a timeline. the chain of events of the massacre. police pointing out two minutes after arriving at the school, he discharged his weapon. he set down the ar-15 rifle and started blending with the students. that's how he fled the scene according to authorities. they say he stopped by a walmart. purchased a drink and sandwich. then he stopped by a mcdonald's. about an hour later, a coconut creek police officer saw him in a residential area and says that his training kicked in. he noticed that ...

>> i saw him put the gun to dustin's head, and i heard bang bang chhhhh, and then the window shattered of the car. >> reporter: just ten days before christmas in 2013, as the friedlands carry their shopping bags back to the car, two men confront dustin and kill him. getting away with the suv, and leaving jamie behind. >> i just knew -- i knew when i turned around. i knew what i was going to see. >> reporter: in court today, police pointing to surveillance video which they say shows the suspects casing the mall parking lot in an suv before the murder. the man standing trial today is believed to...