PASSENGER ON ACR MLG SUFFERED CARDIAC ARREST. PIC DECLARED MEDICAL EMERGENCY TO EXPEDITE ARR.

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DURING REVENUE FLT FROM ONT TO SJC; PAX SUSTAINED COMPLETE CARDIAC ARREST AND FELL TO THE FLOOR IN FIRST CLASS SECTION. F/A'S AND A PAX BEGAN CPR AND ADVISED COCKPIT CREW OF EMER OVER CABIN COCKPIT INTERPHONE. CAPT ASKED ME IF I KNEW CPR; AND WHEN I TOLD HIM 'YES;' HE SENT ME BACK TO CABIN TO ASSIST F/A'S IF NEEDED AND CONFIRM PAX CONDITION. CAPT THEN ADVISED LAX CENTER OF SITUATION AND WARNED THEM TO POSSIBLY EXPECT THE DECLARATION OF AN EMER SITUATION. AFTER A FEW MINS OF CPR; THERE WAS STILL NO PULSE OR SPONTANEOUS RESPIRATION OF PAX. I ADVISED THE CAPT OF THIS AND HE DECLARED A MEDICAL EMER. CAPT ASKED FOR AND WAS IMMEDIATELY GRANTED PRESENT POS DIRECT SJC AND SPD AT OUR DISCRETION. CAPT ALSO EXERCISED HIS EMER AUTHORITY FOR DELETION OF 250 KT SPD RESTRICTION BELOW 10000' MSL. ATC DID A SUPERB JOB IN HELPING US TO GET TO SJC AS QUICKLY AND AS SAFELY AS POSSIBLE (DIRECT ROUTINGS; MINIMUM OF STEPDOWN DSCNT CLRNCS AND GOOD TFC ADVISORIES. JUST AS IMPORTANT; THEY DID THIS WHILE ASKING THE BARE MINIMUM OF QUESTIONS. THIS WAS IMPORTANT BECAUSE WE WERE ONLY A 2-M CREW. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: PAX WAS WORKED ON BY PARAMEDICS AND THEN TAKEN TO HOSPITAL WHERE HE EXPIRED. PAX WAS VERY LARGE MAN AND PARAMEDICS HAD TROUBLE GETTING HIM OFF ACFT DUE TO NARROW AISLES. FAA HAS ASKED FOR NO RPT BECAUSE OF DECLARATION OF EMER. RPTR THINKS SOMETHING IS NEEDED TO ASSIST GETTING LARGE; INCAPACITATED PAX OFF ACFT.