I didn't know Tim Russert on a personal level. I rarely even saw him in his own element as host of NBC's Meet the Press. However, when he suddenly died last Friday, it hit me like a ton of bricks. It was the fact that he was a huge presence on television, particularly during this year's Presidential election. It made Russert feel like he was a part of the family.

So it has been with many television personalities that have left this earth before their time. It's the intimacy of the industry and the fact that this person has come into our homes night after night, week after week, that the unexpected death of these personalities hits us much harder than, say, movie stars. Unfortunately, there have been a number of these surprising deaths over the last few decades. Here are 12 such deaths that affected millions of television viewers.