as investigators worked to piece together a motive. ramos s aunt shelby telling me she s in disbelief. my heart hurts for everyone right now. do you have any idea why he flipped. people go through things and nobody understands. everybody has, i don t know what was going on. reporter: while he had no known criminal history or record of mental health illness, a series of private messages posted on facebook give a chilling warning. the third post, less than 15 minutes before arriving at the school was i m going to shoot an elementary school. across texas, emotions running high. former congressman beto o rourke running for governor in texas disrupting his opponent greg abbott s news conference on wednesday saying another shooting would happen without real reform. you re doing nothing. no. he needs to get his sir, you re out of line. reporter: as so many others struggle to make sense of yet another mass shooting. this morning the painful images are continuing t