Trayvon Martin's mother to AP: Justice Department let Zimmerman get away with murder

Sybrina Fulton, mother of Trayvon Martin, speaks with the Associated Press in Miami, Wednesday, Feb. 25, 2015. The U.S. Justice Department said Tuesday, Feb. 24, 2015, that George Zimmerman, the former neighborhood watch volunteer will not face federal charges in the shooting death of unarmed 17-year-old Martin. Zimmerman was acquitted in 2013 of second-degree murder. (AP Photo/Marta Lavandier) (The Associated Press)

Sybrina Fulton, mother of Trayvon Martin, speaks with the Associated Press in Miami, Wednesday, Feb. 25, 2015. The U.S. Justice Department said Tuesday, Feb. 24, 2015, that George Zimmerman, the former neighborhood watch volunteer will not face federal charges in the shooting death of unarmed 17-year-old Martin. Zimmerman was acquitted in 2013 of second-degree murder. (AP Photo/Marta Lavandier) (The Associated Press)

The mother of Trayvon Martin says she's disappointed with the Justice Department's decision not to prosecute her son's killer.

Thursday is the third anniversary of the night George Zimmerman shot her unarmed teenager while volunteering for a neighborhood watch group in Sanford, Florida.

Sybrina Fulton tells The Associated Press that she still believes Zimmerman got away with murder.

Zimmerman claimed he shot Martin in self-defense, and a Florida jury acquitted him of second-degree murder.

The Justice Department said Tuesday it found insufficient evidence to prove Zimmerman willfully deprived Martin of his civil rights or killed him because of his race.