ACR-MLG FORCED TO EXECUTE GO AROUND BECAUSE THE ACR-HVT AHEAD OVERSHOT TURN TO FINAL AND CONFLICTED WITH MLG'S VISUAL APCH.

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ASSIGNED HDG 070 DEGS AFTER XING SANTA MONICA VOR AT 4000'. ACFT AHEAD WAS HVT Y. HVT Y WAS CLRED FOR A VISUAL APCH TO THE NORTH COMPLEX AT LAX. I ESTIMATE HIS ALT TO BE 3000'. WE WERE THEN INSTRUCTED TO MAINTAIN VISUAL SEP ON THE ACFT AHEAD; REQUESTED TO TURN TO 160 DEGS AND CLRED FOR THE VISUAL APCH TO RWY 25L; LAX. AS WE MADE OUR TURN HVT Y TURNED TO HDG OF APPROX 210 DEGS WHICH ANGLED ACROSS THE FINAL APCH COURSE OF BOTH THE N AND S COMPLEX RWYS OF THE ARPT. WE STOPPED OUR DSCNT AT 3000' (HVT Y HAD DSNDED TO APPROX 2000'). WE COULD NO LONGER MAINTAIN VISUAL CONTACT WITH HVT Y AS THEY PASSED BENEATH US. WE WERE ALIGNED FOR A STRAIGHT IN TO RWY 25L WHEN HVT Y REAPPEARED TO OUR LEFT STILL HDG SW-ERLY; NOW S OF THE RWY 25L APCH COURSE. WE DECLARED WE WERE GOING AROUND (AT 3000' WE WERE NOW TOO HIGH TO MAKE A SAFE; NORMAL APCH LNDG). LAX ATC REPLIED 'NEGATIVE.' WE AGAIN STATED SLOWLY AND DISTINCTLY WE WERE GOING AROUND. LAX ACKNOWLEDGED AND REQUESTED WE MAINTAIN OUR PRESENT HDG AND ALT (250 DEGS/3000'). LAX ASKED HVT Y IF THEY HAD THE ARPT AND THEY STATED THEY HAD LOST THE ARPT. WE CHANGED FREQ; CONTINUED THE MISSED APCH AND RETURNED FOR ANOTHER APCH LNDG W/O FURTHER INCIDENT. I DON'T KNOW THE FURTHER PROGRESS OF HVT Y ACFT. CONCLUSION: EVEN THOUGH BOTH ACFT WERE CLRED FOR VISUAL APCH; I FEEL THAT LAX APCH/TWR SHOULD HAVE MONITORED MORE CLOSELY THE FLT PATH OF HVT Y AND ISSUED INSTRUCTIONS TO TURN TO A CORRECTIVE HDG AFTER XING THE RWY 24R FINAL APCH COURSE. ADDITIONALLY; THE CREW OF HVT Y SHOULD HAVE DECLARED THAT CONTACT WITH THE ARPT WAS LOST AND REQUESTED A VECTOR HDG TO CORRECT THEIR EXCURSION ACROSS THE FINAL APCH COURSES OF RWYS 25R AND 25L (OR MADE A MISSED APCH); I JUDGE ALSO A CONTRIBUTING FACTOR WOULD BE THE WORKLOAD OF THE ATC FINAL CTLR. OBVIOUSLY THE PATH OF HVT Y WAS NOT MONITORED VERY CLOSELY. SLIGHTLY HAZY CONDITIONS COULD HAVE CONTRIBUTED TO HVT Y'S CREW BECOMING DISORIENTED.