Photos Taken Just Before a Disaster

There are times when we know something terrible is going to happen, but we can't do anything about it.

These moments will always stay in our heads, and these images really capture the tragedy.

Some of these moments were horrific, and have really impacted the lives of these people forever.

Here are the most incredible photos taken just before tragedy struck. 

William Sanders: A Teacher Who Sacrificed Everything For his Students

William "Dave" Sanders was a teacher at Columbine School during a shooting in 1999.

He warned the students in the cafeteria that a shooting was happening and saved hundreds of lives. William died in the shooting.

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