CL65 FLC HAS TCASII RA DURING APCH INTO SAT.

Narrative

APCH CTLR ASSIGNED DSCNT FROM 6000 FT TO 3000 FT; MAINTAIN 250 KTS; HEADING 290 DEGS. TOLD TO EXPECT A VISUAL APCH TO RWY 12R. APCH THEN CALLED OUR ATTN TO TFC ON CLBOUT. PNF CALLED TFC IN SIGHT APPROX 10 NM ON AN EBOUND COURSE; S OF OUR POS. APCH THEN CALLED A SECOND ACFT TO OUR ATTN. PNF CALLED IN SIGHT APPROX 7-8 NM AT OUR 10-11 O'CLOCK POS. PF DID NOT VERIFY IN SIGHT. APCH GAVE US CLRNC TO MAINTAIN VISUAL SEPARATION. PNF ACKNOWLEDGE CLRNC. DEPARTING ACFT WAS NOT ON SAME FREQ. PNF SAW DEPARTING ACFT START A L TURN TO THE E AND ASSUMED THEY WOULD FOLLOW THE SAME PATH AS THE FIRST TFC. AT THIS POINT WE WERE APPROX 3-4 MI FROM DEPARTING ACFT. DUE TO OUR CLOSE PROX TO THE ARPT AND ASSIGNED SPD WE WERE DSNDING AT 2000 FPM. PF AND PNF BECAME PREOCCUPIED WITH DSCNT PLANNING AND PNF LOST SIGHT OF DEPARTING ACFT. AGAIN PF NEVER SAW TFC. AT APPROX 5000 FT WE RECEIVED A 'TFC; TFC' TA FOLLOWED IN RAPID SUCCESSION BY 'MONITOR VERT SPD' AND 'CLB; CLB;' RA'S. WE COMPLIED WITH THE RA'S AND RECEIVED 'CLR OF CONFLICT.' RA'S RECEIVED AT 4500 FT. VERT SEPARATION WAS ABOUT 500 FT. WE WERE THEN CLRED FOR A VISUAL APCH TO RWY 12R AND LANDED UNEVENTFULLY. THIS WAS THE LAST LEG OF A 12 HR DUTY DAY PRECEDED BY A 9 HR OVERNIGHT AND ANOTHER 12 HR DUTY DAY. WE WERE BOTH FATIGUED AND COM WAS POOR. COMBINED WITH THE LATE DSCNT AND HIGH AIRSPD AND THE OTHER ACFT ON A DIFFERENT FREQ; WERE ALL FACTORS IN THIS INCIDENT.