Help a small family with a tragic loss of of a son

My only brother suddenly lost his life due to sudden unexplained medical events. He left behind a young wife, a mother and me, his sister. He was a healthy young men who was loved and respected by so many people. On December 1st, getting ready to go to bed he went to take a shower. A few minutes later he called on his wife saying he wasn’t feeling well. He was pale as a ghost and began to lose his consciousness. 911 rushed him to the ER where he was pronounced dead a few hours later due to internal bleeding of unknown causes. 
He was 29 years old, just 2 months shy of his 30th birthday. 
No words can describe the devastation and pain my family is going through. Any help will be greatly appreciate.