One of coworkers passed away. I dont want to go back to work.
Oh no. I am so sorry to hear that. Were you close with this coworker?
Yes, we were good friends. 
Than I completely understand that would be so hard
Yes. I was out of the state when it happened. I missed the funeral.
That would even make it worse. Did it happen all of a sudden?
Yes. It was very shocking.
I am so sorry for the loss. Good friends are so hard to come by