REPORTER: INVESTIGATORS WERE TRYING TO FIGURE OUT HOW THIS HAPPENED, AS WELL AS WHY THIS HAPPENED. THE CRIME SCENE TAPE REPLACED WITH A MEMORIAL TO THE VICTIMS. TONIGHT, PRAYERS AMIDST PAIN. A MOMENT TO HONOR THE FIVE LIVES LOST. THE YOUNGEST AMONG THOSE VICTIMS JUST 14-YEARS-OLD. >> IT’S ENOUGH. THEY’RE KILLING OUR FAMILIES. MILWAUKEE IS BETTER THAN THIS. >> I AM SICK TO MY STOMACH RIGHT NOW WITH THIS VIOLENCE. >> IT’S TOO MUCH GOING ON WITH THIS CORONAVIRUS. PEOPLE JUST NEED TO THINK BEFORE THEY REACT. REPORTER: ALSO TONIGHT, THE SEARCH FOR A MOTIVE. WHY WOULD SOMEONE KILL THE GROUP INSIDE A HOME NEAR 12TH AND LOCUST MONDAY MORNING? INVESTIGATORS HOPE THOSE ANSWERS WILL COME FROM THE PERSON THEY HAVE IN CUSTODY, THE MAN WHO CALLED 911. >> MILWAUKEE POLICE DEPARTMENT RECEIVED A CALL FROM AN INDIVIDUAL WHO STATED THAT HIS FAMILY WAS DEAD. REPORTER: WHILE POLICE TELL US THERE’S NO EXISTING THREAT TO THE PUBLIC, THERE IS COLLECTIVE GRIEF. >> THIS IS AN EMOTIONAL THING FOR EVERYBODY INVOLVED, EVEN IF FOLKS DIDN’T KNOW THEM DIRECTLY. TO HEAR SOMEBODY LOST THEIR CHILD, TO SEE SOMEBODY CRYING, IT’S EMOTIONAL FOR EVERYBODY. REPORTER: AT SEVERAL POINTS THE AREA AROUND THE CRIME SCENE WAS EXTREMELY CROWDED, A CONCERN FOR HEALTH OFFICIALS DURING THE ONGOING PANDEMIC BECAUSE OF THE PEOPLE AND POLICE ALL GATHERED IN ONE PLACE. >> DOESN’T APPEAR ANY OF THOSE OFFICERS IN THAT AREA ARE WEARING MASKS. THEY’RE TRYING TO STAY SPACED APART AS BEST THEY CAN AND KEEP THE INTEGRITY OF THE SCENE. PATRICK: DERRICK JOINS US ONCE AGAIN. WHAT ARE POLICE SAYING? REPORTER: THEY HAVE NOT RELEASED THE MAN, HIS NAME OR AGE