>> the desperate manhunt. >> command was given, go, go, go. >> right here? >> right there. >> and the search for answers. >> these people had a plan. it's sadistic, it's horrific. >> tonight, a cnn special report -- the d.c. mansion murders. sunday, may 3rd, near phoenix, arizona. a race day for philip. the 10-year-old son of saba and amy selopolis. >> he was passionate beyond belief. no matter how he did on track, he'd be smiling ear to ear. >> james howard is philip's coach. in this exclusive cnn interview he recalls their last race. >> a typical day we would get up in the morning. breakfast. go to a track. >> amy and sava followed his races all over the country,