Finished "The Time Tarveler's Wife" last Friday! MORE SPOILERS!!!

It came as no surprise that Henry did indeed pass away. The explanation of his not being able to control this aspect of his life was because it already happened when Clare was thirteen. Apparently, Henry never had any conscious control over his life and excepted his death with good grace at the end. What makes Henry's death sickening is that Clare's own father and brother were the ones to shoot him on a day when the two had decided to go hunting and Henry had, unfortunately, time traveled to that exact instance while being rendered helpless due to his poor physical state resulting from the blizzard he had been trapped in. Of course, with careful observation, one could have predicted Henry's death from the beginning of the story, when thirteen year old Clare awoke to her dying husband's-to-be cries of 'Clare! Clare!' and found her brother and father near a red stained patch of grass with another self of Henry's at the scene. Henry was, no doubt, aware that he had occupied that patch of grass moments before.
The ending to The Time Traveler's Wife was sad, but also happy in a way. Past selves of Henry's continuously visit Alba in the future, and so he is able to spend stolen time with his beloved daughter. On the other hand, Henry never appears to Clare, except for one final time when Clare is 82. Until then, Clare continuously waits for Henry on his word that they will see each other again. It seems that no matter the circumstances, Clare is destined to always wait for Henry, always filled with the anticipation and relief that comes with his reappearances. Unhindered by his death, Clare forever waits for her love.