Again, I'm sorry to hear about this situation.
If this didn't happen, and you'd like to recant your statement, then you'll need to speak with the prosecutor assigned to his case.
You'll need to let the prosecutor know that you gave an incorrect statement, and that you do not want to proceed with the case and are not willing to testify.
(You cannot be forced to testify in the case).
Keep in mind, that even though you let the prosecutor know that you don't want to proceed with the case, that does not mean the case will automatically be dismissed.
The prosecutor now has a duty to pursue and investigate the case, and if there is enough evidence without your testimony, they may still decide to continue with the charges.
Other evidence can include witness statements, photos, the 911 recording, etc.
I hope that helps! Please let me know if you have any other questions. Also, please take a moment to rate me using the stars at the top of the page, as it's the only way experts are compensated for our time on the site. I do not receive a salary here at JustAnswer, and am only compensated for my time after receiving a rating of 3 stars or more. The question won't close after rating, so you can still ask follow-up questions after. Thanks, ***** ***** it!