For some reason he felt that Trayvon, the way that he was walking or appeared seemed suspicious to him, Lee said. He called this in and at one part of this initial call [the dispatcher] recommends him not to follow Trayvon. A police officer is on the way at that point.
Lee said that Zimmerman instead followed Martin.
I believe that Mr. Zimmerman was trying to, by his account, find an address to give the officers and also trying to keep Trayvon in eyesight.
Zimmerman told the police that Martin noticed that he was being followed and asked, whats your problem?
That's when a physical confrontation ensued, Lee said. And moments later, Martin was shot.