Robert Card killed at least 18 people in a horrific mass shooting in Lewiston, in Maine. Dailymail.com reporter Caitlyn Becker explains everything we know. #dailymail #RobertCard #lewiston Daily Mail Homepage: https://www.dailymail.co.uk/ Daily Mail Facebook: https://facebook.com/dailymail Daily Mail IG: https://instagram.com/dailymail Daily…