Photos from George Zimmerman investigation

Feb. 27, 2012: Police photographs taken within hours of the altercation show injuries to shooter George Zimmerman. (Florida State Attorney's Office)

Feb. 26, 2012: Police took this crime scene photo on the evening Travon Martin was shot and killed by George Zimmerman. (Florida State Attorney's Office)

Feb. 26, 2012: Police took this crime scene photo on the evening Travon Martin was shot and killed by George Zimmerman. (Florida State Attorney's Office)

Feb. 27, 2012: Police photographs taken within hours of the altercation show injuries to shooter George Zimmerman. (Florida State Attorney's Office)

Feb. 27, 2012: Police photographs taken within hours of the altercation show injuries to shooter George Zimmerman. (Florida State Attorney's Office)

Feb. 27, 2012: Police photographs taken within hours of the altercation show injuries to shooter George Zimmerman. (Florida State Attorney's Office)

Feb. 27, 2012: Police photographs taken within hours of the altercation show injuries to shooter George Zimmerman. (Florida State Attorney's Office)

Feb. 27, 2012: Police photographs taken within hours of the altercation show injuries to shooter George Zimmerman. (Florida State Attorney's Office)

Feb. 27, 2012: A police photo shows the crime scene in daylight one day after the deadly shooting. (Florida State Attorney's Office)

Feb. 28, 2012: Florida authorities released this photo showing the Kel-Tec PF-9 9mm handgun George Zimmerman used to shoot Trayvon Martin. (Florida State Attorney's Office)