you joined the BAU the same time spencer did. You have been best friends ever since. there was a newly opened case; male unsub kidnapper and murderer and no one at the BAU could solve the case, till you went over the case one late night around 3:51 AM and realized every piece of evidence the timing and how neat everything was screamed Spencer your heart started to beat out of your chest when you start to realize you have been working with a serial killer. the next morning you see him at work