CHEST DURING AN ATTEMPTED ROBBERY. A SHOOTING AFTER A STRUGGLE WITH AN ALLEGED THIEF. MARISA PARRA HAS THE DETAILS. >> SHOCKING VIDEO SHOWS 49ERS ROOKIE PEIRSOL AFTER HE WAS SHOT IN BROAD DAYLIGHT. SAN FRANCISCO POLICE SAY THE 23-YEAR-OLD WAS THE VICTIM OF AN ATTEMPTED ARMED ROBBERY SATURDAY JUST HOURS AFTER SIGNING AUTOGRAPHS AT A PUBLICITY EVENT. IN A FACEBOOK POST PEIRSOL'S MOM WROTE, HE WAS SHOT IN THE CHEST AND IT EXITED OUT HIS BACK. IT MISSED HIS VITAL ORGANS AND MY SON WAS SPARED TODAY BY THE GRACE OF GOD. IT HAPPENED HALF PAST 3:00 IN BUSTLING UNION SCARE. A TEEN TRIED TO ROB HIM AND THE TWO STRUGGLED AND BOTH PEIRSOL AND THE SUSPECT WAS SHOT. >> WE NEED TO CONFIRM EXACTLY HOW. >> PEIRSOL WAS SEEN ON KTVU VIDEO WALKING SLOWLY TO THE AMBULANCE WITH THE FIRST OF FIRST RESPONDERS HOLDING ON TO HIM. >> THE 17-YEAR-OLD SUSPECT IS NOW IN POLICE CUSTODY. MEANWHILE, PEIRSOL HAS SINCE BEEN RELEASED FROM THE HOSPITAL. >> WE'RE 49ERS! >> THE ROOKIE WAS ON THE BRINK OF HIS NFL DEBUT AS THE 49ERS FIRST-ROUND PICK IN THE SPRING. HE WAS RECOVERING FROM HAM SPRING AND SHOULDER INJURIES DURING THE PRE-SEASON AND SAID LAST MONTH HE WAS EAGER TO PLAY. >> I'M UP FOR THE JOB, AND I'M EXCITED TO GET STARTED. >> SAN FRANCISCO'S MAYOR SPEAKING FOR FANS EVERYWHERE. >> HE HAS A BRIGHT FUTURE, AND I LOOK FORWARD TO SEEING HIM RECOVER AND GET BACK ON THE FIELD. >> IT'S UNCLEAR WHEN HE'