 Investigators continue to dig here at the gunman's home in Bethel Park. We're just about an hour south of where the tragic shooting took place. Federal agents are keeping a tight perimeter around this area as they continue to comb and dig for evidence confirming that Thomas Matthew Crooks acted alone. So we know he graduated, the 20 year old graduated from high school just about two years ago. And we've confirmed he worked as a dietary aid at a local skilled nursing and rehabilitation center.