what have you learned, anna? >> police say they are questioning a so-called person of interest. they say tips from the public led them to a house where they did surveillance and followed this individual to a parking lot where they took him into custody without incident. they are not calling him a suspect now, so they aren't releasing names but this could be a huge break in the case coming more than 24 hours after the murder of an innocent little girl. a community seeking justice for lily. 4-year-old lily garcia, a little girl shot and killed while riding in the backseat of her family's red pickup truck. a crime that let veteran law enforcement in shock. >> to me, this is one of those crimes, which is unexplainable. i have never seen it before. >> reporter: new mexico investigators are calling ate classic case of road rage. >> this should have never happened. this is a complete disrespect of human life. >> reporter: it happened around