As I recall they were looking at the area and the reporter walked up to them and only then found out who they were.
Here's the link
At 0:12, the reporter, identified as Keith Landry, is on the dogwalk, a few units south of the shooting site. Tracy and Brandy are visible behind him in the distance, walking toward him on the sidewalk.
The reporter walks toward the shooting site, points it out, and points out the back of W-6's unit. Then there is a cut to the famous behind-the-front-door interview of W-6, intercut with clips of police working the crime scene the previous night.
At 0:56 the video cuts back to the backyard. Now the camera points north, and Tracy and Brandy are walking from that direction, taking a few steps before stopping near the shooting site. The reporter isn't in frame, but I think it's the same voice.
Reporter: Was that a friend of yours?
Tracy: That was my son.