It's been less than a week since murder set their lives onto a new course, into roles they never wanted to take on and into a battle they never planned to fight.
But only five days in, Andy and Barbara Parker -- the parents of slain television journalist Alison Parker -- speak about gun control with a passion as if they'd spent their lifetimes fighting for it.
"You can't change the world in a day," Barbara Parker told CNN. "But we cannot be intimidated, we cannot be pushed aside."
On Wednesday, Alison Parker and cameraman Adam Ward -- two journalists for WDBJ in Roanoke, Virginia -- were killed on live television by a disgruntled former employee.
In the days since, Andy Parker has emerged as perhaps the world's most visible advocate for gun control, making numerous appearances on numerous networks and even holding a news conference.
Luigi Mangione was indicted on Thursday on a federal murder charge in the killing of UnitedHealthcare...
