B737-300 FO WAS ILL AND BECAME INCAPACITATED IN ARR TO SLC.

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ON A FLT FROM DETROIT TO SALT LAKE CITY; THE COPLT RPTED THAT HE FELT SICK; WAS HAVING STOMACH PROBS; AND MADE 2-3 TRIPS TO THE BATHROOM. 1/2 WAY ALONG THE RTE; HE CALLED IN TO THE COMPANY RADIO TO HAVE HIMSELF REMOVED FROM THE TRIP. HE SAID HE WAS OK TO COMPLETE THIS FLT. WE FLEW THE BRIGHAM CITY ARR TO A VISUAL APCH TO RWY 16L AT SLC INTL. WX WAS A BROKEN CEILING AT ABOUT 12000 FT MSL; WITH 10+ MI VIS UNDERNEATH. AT 9000 FT MSL; IN THE CLR; THE COPLT TOLD ME HE WAS GOING TO BE SICK AGAIN. RATHER THAN HAVE HIM GET SICK IN THE COCKPIT; IN A CRITICAL PHASE OF FLT; I TOLD HIM TO GO BACK TO THE FIRST CLASS LAVATORY. I FLEW A COUPLED ILS APCH IN VISUAL CONDITIONS; COMPLETED THE CHKLISTS; AND DID A MANUAL LNDG. AFTER LNDG; I CLRED THE RWY; STOPPED; AND COMPLETED THE AFTER LNDG CHKLISTS. AT THAT POINT; I TALKED TO THE LEAD FLT ATTENDANT ABOUT THE COPLT AND SHE SAID HE WAS STILL IN THE BATHROOM. SINCE THE WX WAS GOOD AND THERE WAS LITTLE TFC ON THE RAMP; I ELECTED TO TAXI TO THE GATE FOR A NORMAL SHUTDOWN. THE COPLT RE-ENTERED THE COCKPIT AFTER WE WERE PARKED AT THE GATE. SUPPLEMENTAL INFO FROM ACN 492311: ON FLT FROM DTW TO SLC; I BECAME SICK TO MY STOMACH AND HAD TO LEAVE THE COCKPIT ON A 12 NM FINAL TO LAND RWY 16L. I HAD NOT FELT GREAT SINCE AWAKENING; BUT DID NOT FEEL ILL. DURING THE FLT I SLOWLY BEGAN TO FEEL WORSE AND MADE 2 TRIPS TO THE LAVATORY. ON APPROX 12 NM FINAL APCH TO SLC RWY 16L; I WAS OVERCOME WITH NAUSEA AND I ASKED THE CAPT THAT IF I GOT SICK DID HE WANT ME IN THE COCKPIT OR OUT. HE SAID IT WAS MY CHOICE. I LEFT THE COCKPIT THEN I DID NOT RETURN UNTIL THE ACFT WAS PARKED AT THE GATE. I FELT THAT THE CAPT WOULD BE LESS DISTR IF I LEFT THE COCKPIT BEFORE I GOT SICK; THEREFORE; MAKING THE APCH EASIER AND SAFER. I FELT NOWHERE NEAR ILL ENOUGH BEFORE LEAVING DETROIT TO CALL IN SICK FOR THE FLT.