Aaron Hernandez’s attorneys say key witness lied, tried to extort NFL star

( CNN) “My question to you, sir, is: Who are you really? “

So began the defense’s merciless cross-examination on Tuesday of Alexander Bradley, a former pal of Aaron Hernandez and the central witness in the double-murder experiment against the former NFL star.

That question from Jose Baez, Hernandez’s defense attorney, provisioned a revealing preview of the often tense and fiery questions posed to Bradley.

Opening announcements in Aaron Hernandez trial