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.
On Sunday, both of the Parkers spoke to CNN's Poppy Harlow, telling her that ending gun violence has become each of their lives' missions -- and the grieving parents pledged to be as unrelenting and as feisty as their daughter in achieving it.
\"Alison would be really mad at me if I didn't take this on,\" said Andy Parker. \"And I promise you, these people are messing with the wrong family. We are going to effect a change.\"