I heard some information was leaked the night before. Because numerous fans found said information upsetting, this post thing was taken down. I am about to tell you this, the ending to Thank You and Goodbye.
Amy will break it off with Ricky and choose Ben. After telling Ben that she's his, he goes for a drive. Since he is so happy, he's not paying attention. A drunk driver will crash into his car and will kill him. The last scene is supposedly the paramedics pulling a sheet over his face, thus ending The Secret Life of the American Teenager as we know it.