LAX86MA074

Drg arr, the acft was vectored for an lda rwy 19R apch. After being clrd for the apch, the plt was advised that radar svc was terminated & told to contact the twr. At 2033 PST, he rprtd inbnd at the final apch fix & was clrd for the apch. Aprx 2 min later, he declared a missed apch. The twr controller (ctlr) instructed the plt to contact travis dep ctl, butonly a 'garbled' reply was heard. There was no further rdo contact with the acft. After crossing the arpt on a sse hdg, the acft entered a left clbg turn as if to begin the missed apch procedure, then it turned rgt as if to begin a dwnwnd &base leg for rwy 1L. Witnesses rprtd the acft entered clds & shortly thereafter, it reappeared in a steep, dscndg, rgt turn. It then crashed into a dept store aprx 1 mi south of the arpt while in a 32 deg rgt bank, 6 deg nose low attitude. No preimpact part failure/malfunction was fnd that would have led to the acdnt. The wx (in part) was: 400' obscd, vis 3/4 mi with fog; same as lda mins. Mins for circling apch were 600' & 1 mi. No cockpit voice recorder installed or reqd.