principle. after a month, he stopped taking xanax, also cold turkey. >> all of a sudden he can't function. >> can't sleep. can't eat. shaking. crying. >> at that point, were you thinking that it could be the medication that he's on or you're just thinking he's lost it? >> we had no idea. >> we had no idea. we're like jonathan, what's wrong? >> their son's transformation left the wagner's stunned. just a few months before, jonathan's life was full of promise. >> this is who jonathan was right before it all started. >> i mean, he just looks like a normal guy having a good time. >> and i have the video of jonathan after. >> i took the video cause when