Rep. Gabrielle Griffords , the Arizona congresswoman who was nearly killed by a gunman , one year ago , announced Sunday that she'll step down from the U.S. House this week .
Rep. Giffords says she needs to focus on her continued recuperation from last January's shooting .
"Thank you for your prayers and for giving me time to recover ," Giffords says in a video posted on her YouTube Channel . "I have more work to do on my recovery . So to do what is best for Arizona , I will step down this week."
Giffords adds , "I don't remember much from that terrible day , but I will never forget the trust you placed in me to be your voice ."