HOLY CROSS HOSPITAL A FEW BLOCKS AWAY. HE HAS SINCE BEEN TRANSFERRED TO MOUNT SINAI. NO ONE IS IN CUSTODY. >>> HUNDREDS OF VIDEOS I A BANK CARD HELPS INVESTIGATORS TRACKED DOWN THE MAN WANTED FOR MURDER IN CHICAGO POLICE OFFICER LUIS HUESCA. >> THOSE DETAILS COMING OUT THE ACCUSED KILLERS FIRST COURT APPEARANCE TODAY. CBS 2'S SABRINA FRANZA JOINED US FROM THE NEWSROOM, AND SABRINA, THE OFFICER'S FAMILY WAS IN COURT TODAY AS WELL. >> Reporter: THEY BOTH WERE. THE EVIDENCE WAS EXPENSIVE. THE STATE PRESENTED A CASE BASED OFF OF, THEY SAY, HUNDREDS OF SURVEILLANCE VIDEOS ALL SHOWING XAVIER TATE JR. BEFORE AND AFTER THE MURDER. AS THE FAMILY WALKED OUT OF THE COURTROOM, DOZENS OF OFFICERS LINED THE WAY OF COOK COUNTY CRIMINAL COURT FOR THEM. AN EMOTIONAL SHOWING OF THEIR SUPPORT FOR THEIR FALLEN BROTHER. >> NOW ALL THE PEOPLE THAT HAVE SUPPORTED US IN THIS HORRIBLE PAIN , IT IS A VERY SAD LOSS OF MY LOVELY SON. THANK YOU SO MUCH FOR YOUR SUPPORTING, SUPPORTING OUR FAMILY. >> Reporter: EDITH HUESCA, MOTHER OF SLAIN OFFICER LUIS HUESCA, OR HER SONS STAR NUMBER ON HER NECKLACE AND ON HER CHEST. >> AND WE, YES -- SO WE ARE VERY SAD. >> Reporter: AFTER HEARING ALLOWED IN COURT WITH OFFICER HUESCA'S BROTHER BY HER SIDE THE EVIDENCE GATHERED AGAINST THE MAN POLICE SAY KILLED HER SON IN COLD BLOOD. XAVIER TATE JR., THE 22-YEAR-OLD ACCUSED KILLER, SAT EMOTIONLESS IN COURT AS THOSE DETAILS WERE READ ALOUD. PERSECUTORS RECOUNTED EVIDENCE THAT BEGAN 36 HOURS BEFORE THE MURDER EVEN TOOK PLACE. THEY REFERENCED THESE VIDEOS, WHICH WERE ORIGINALLY RELEASED BY POLICE, SHOWING, THEY SAY, TATE PURCHASING GUM USING HIS MOTHER'S EBT CARD, SOMETHING THEY USE TO TRACK HIM FROM THE SCENE TO THIS ONE. ANOTHER CONVENIENCE STORE, WE'RE TOLD, WHERE HE USED THE SAME CARD. HE'S WEARING A DIFFERENT OUTFIT. PROSECUTORS MENTIONED A WITNESS TO NOTICED HIM CHANGING HIS CLOTHES OUTSIDE THEIR WINDOW AND TOOK A PICTURE. JUST BEFORE THE MURDER, WE'RE TOLD MORE VIDEO SHOWS TATE WALKING AS OFFICER HUESCA'S CAR DRIVES BY. THE STATE CLAIMS TATE APPROACHED OFFICER HUESCA WHILE HE WAS IN UNIFORM IN HIS DRIVEWAY, AND SHOT HIM 10 TIMES FROM THE DRIVER'S SIDE WINDOW. THEY SAY A NEIGHBOR IN THE AREA LOOKED OUT THE WINDOW, SAW OFFICER HUESCA ON THE GROUND NEXT TO HIS CAR, SHOT IN THE FACE AND ELSEWHERE , WITH TATE STANDING OVER HIM. THEN, WE'RE TOLD THAT NEIGHBOR SAW TATE TAKE HUESCA'S CAR AND FLEE. >> THIS VIDEO, AND THE ASSISTANCE FROM THE GAGE PARK COMMUNITY, WAS INSTRUMENTAL. >> Reporter: CHICAGO POLICE AND OTHER LEADERS OUTLINE SOME OF THE SAME EVIDENCE MENTIONED IN COURT. >> EVERY T WAS CROSSED TWICE. >> Reporter: THE EVIDENCE PROSECUTORS SAY NOT ONLY TRACKED TATE TO THE SCENE OF THE CRIME, BUT ALSO SHOWED HIM DITCHING THE CAR IN AN ALLEY NEARBY, DITCHING HIS CLOTHES, LEADING TO WISCONSIN, IOWA, AND ROCKFORD, ILLINOIS, BEFORE HE WAS LOCATED IN GLENDALE HEIGHTS. THE PROSECUTION SUMMARIZED THEIR CASE BY SAYING, QUOTE, HE LEFT BECAUSE OF HIMSELF AT EVERY TURN. >> TODAY I FEEL A LITTLE BIT OF RELIEF. >> Reporter: THE JUDGE ORDERING TATE BE HELD. >> I HOPE MY BROTHER GETS THAT JUSTICE THAT HE DESERVES. >> Reporter: RIGHT NOW, XAVIER TATE JR. IS REQUESTING A TRIAL. HIS NEXT COURT DATE IS SET FOR
