Ken,
I am truly sorry that your friend and her child wer killed. I am also very sorry that you have faced so many losses in the past few years. It's never easy when somebody innocent dies.
Last July 14th, the 17 year old brother of a childhood friend of mine was hit by a car and killed after playing a game of basketball with some friends. He was walking to the store to get a Gatorade when a speeding driver didn't see him.
Two years before, a sophomore at my school was out boating with his father in November before they were going to put the boat up for the season. The boat capsized in waves, and before they were rescued hypothermia hit him hard, and he died on the rescue boat.
It seems like such a waste and an injustice. Somebody young dying for something as random, unexpected, and as avoidable such as a car accident. It's a bad reminder of human fragility.
Hang in there, man. You've got my condolences, and so has her family. She sounds like she was a great person, and it's tragic that her unborn child also lost its life.
I hope this is the last of your loss for a long time to come, Ken. Good luck.