Zach,
Those of us here on this forum probably know better than most that when a child or loved one is harmed it doesn't stop there. There is never a single victim in situations like this. The ripples spread outward and can affect family and friends, seriously hurting their lives as well.
DONT LET EVIL WIN! Don't give it the satisfaction of destroying another life. Stay strong, lean on friends and us for support. Grieve, get angry!, cry, scream at the universe, smash something, call your preacher, do whatever you have to do to make it one minute, one hour and one day at a time.
Fight for A.J, for the love that the two of you shared and will share again one day in Heaven. Fight for the chance to see whoever harmed her brought to justice.Fight for yourself and for the opportunity to see Gods purpose revealed to you.
Do not surrender! You owe it to yourself, to God and to AJ to triumph over evil.
I promise you that once you do, one day sooner than you think, you will feel her presence and light wash over you, followed by an overwhelming sense of peacefulness. That will be her letting you know that shes loves you and that she's proud of you for not letting her sacrifice be in vain.