When Nick Reiner was photographed alongside his family at the Los Angeles premiere of his father’s comedy musical, “Spinal Tap II,” in September, he wasn’t smiling. Instead, the son of legendary Hollywood director Rob Reiner and producer Michele Singer Reiner stood impassively for the family portrait alongside his siblings.

Prosecutors say Rob Reiner’s son Nick Reiner will be charged with two counts of first-degree murder in the killing of his parents.

"It has of course been a huge shock to the system. This nightmare came out of nowhere for them, but they've been surrounded with support since the second they found out," says the source