IS DUE IN COURT TOMORROW AFTER POLICE SAY HE FIRED SIX SHOTS ON TWO TRAIN CARS. AT LEAST TWO OF THE FOUR VICTIMS WERE IN THEIR 60. AND TONIGHT, THE ANSWER TO WHY REMAINS ELUSIVE. TONIGHT 30 YEAR OLD RONNIE DAVIS OF CHICAGO IS CHARGED WITH FOUR COUNTS OF FIRST DEGREE MURDER IN THE GRISLY, SEEMINGLY RANDOM SHOOTING DEATHS THAT HAVE LEFT INVESTIGATORS WITHOUT A MOTIVE. IT IS HORRIFIC. >> WE WANT ANSWERS RIGHT NOW. >> WE DON'T HAVE AN ANSWER AS TO WHY ANYONE WOULD ENGAGE IN SUCH A HEINOUS, HEINOUS ACT, POLICE SAY. >> DAVIS USED A GLOCK 43 NINE MILLIMETER HANDGUN TO SHOOT AND KILL THREE MEN IN ONE WOMAN WHO WERE ASLEEP ON TWO TRAIN CARS. THE VICTIMS DISCOVERED JUST BEFORE DAWN AFTER THEIR CTA BLUE LINE TRAIN STOPPED AT THE FOREST PARK STATION. THOSE KILLED, IDENTIFIED AS 64 YEAR OLD MARGARET MILLER, 60 YEAR OLD ADRIAN COLLINS, 28 YEAR OLD SIMEON BGC AND A YET TO BE NAMED MAN. THIS WAS AN INCREDIBLY UNFORTUNATE ACT, A CRIMINAL ACT , A LOSS OF LIFE THAT WE ALL GRIEVE FOR. >> SOME 90 MINUTES AFTER THE SHOOTINGS, DAVIS WAS ARRESTED WITH THE ALLEGED MURDER WEAPON ON THE PLATFORM OF THE PINK LINE CALIFORNIA STATION. >> WITH THE HELP OF CTA CAMERAS . >> SURVEILLANCE VIDEO WAS, UH, WAS KEY. UH, ABSOLUTELY. UH, PARTNERING WITH, UH, CTA SECURITY. UH, THAT WAS ABSOLUTELY KEY IN APPREHENDING THE, UH, THE OFFENDER IN THIS IN THIS MATTER, THE OFFICIALS HAVE NOT CONFIRMED WHETHER OR NOT THE VICTIMS WERE EXPERIENCING HOMELESSNESS. >> THE HEAD OF CTA WAS ASKED IF HIS AGENCY HAS DONE ENOUGH TO STEER UNHOUSED PEOPLE TO SHELTERS. >> WE ARE PROVIDING SERVICES TO PEOPLE ON CTA THAT CAN PROVIDE THEM OPTIONS OTHER THAN SLEEPING ON CTA. IF THEY SO CHOOSE TO TAKE ADVANTAGE OF IT. FOREST PARK POLICE SAY THIS IS THE FIRST TIME THEY HAVE HAD CONTACT WITH THAT SUSPECT, BUT SAY HE