We happened upon a major car crash last night, coming back from Christmas Day at my dad's. A car crossed the median from the southbound side of the highway & smashed into 2 cars going northbound on I-675. We saw the dead southbound driver's body (covered up) on the highway as we were made to turn and head back south by the police. Something like 8 cruisers, 3 ambulances, 2 firetrucks, and the Careflight helipcopter were there. Tally so far: 1 death, 2 seriously injured adults, 2 w/minor injuries - kids, & 1 missing dog. It was upsetting and we felt bad for everyone with any involvement.