Deranged Texas killer Salvador Ramos had been trying to buy a gun for at least eight months — and openly chatted about his reputation as a likely school shooter in social media messages posted in the months before Tuesday’s attack, officials announced Friday. “Ramos asked his sister to help him buy a gun” as far back as Sept. 21, Texas Department of Public Safety director Col. Steven McCraw announced Friday as he detailed the killer’s online activity. Then Ramos — who legally bought the rifle he used after turning 18 last week — had numerous group chats on Instagram in...