At some point, Zimmerman ignored the suggestion from a 911 dispatcher that he stop following Martin, left his truck and went to look for Martin.
At the same time, Martin was on the phone with his girlfriend and complained that someone was following him.
What happened then is not clear. The girlfriend has said that she heard Martin ask someone, "Why are you following me?" before the sounds of a scuffle and the phone was disconnected.
Zimmerman is described as 5-foot-9 and well over 200 pounds while Martin was 6-foot-3 and 150 pounds.
Leaks from the police report detail Zimmerman telling police he was heading back to his truck when Martin knocked him down with a punch to his nose, jumped on him, repeatedly banged his head on the ground, then tried to grab Zimmerman's gun.
In a struggle for Zimmerman's gun, the watchman shot the teenager, Zimmerman told police.