To his family, Nathaniel Dennis' life began as a wonder.
Born premature, Dennis survived infancy thanks to a shunt placed in his brain by Ben Carson, the world-famous Johns Hopkins neurosurgeon.
"I remember how tiny he was when his parents brought him home from the hospital," his cousin, Vannette Tolbert, said. "We called him our Miracle Baby."
The Miracle Baby grew up to be a young man who, those who knew him say, loved music, pickup sports and was deeply devoted to his family and friends.
But family members said that when Dennis, 24, suffered a seizure in Liberia two weeks ago, he did not have access to the medical...