Finding rifle was pivotal to capturing Highland Park parade shooting suspect, chief says

The 21-year-old suspect in the Highland Park Fourth of July parade shooting showed no emotion during his virtual court appearance on Wednesday. 

Investigators say Robert Crimo III took aim and fired 83 rounds at spectators from a rooftop, stopping to reload his rifle. Then he made a run for it in women's clothing, leaving his gun behind. 

"He indiscriminately fired at the crowd of people and struck people at random," Highland Park Police chief Lou Jogmen told CBS News in an exclusive interview.