Her message was typical of the maturity and empathy that she has displayed in recent months, leading her to become an equally praised and derided figure in the American political spectrum.
In comparison, Donald Trump, the 71-year-old President of the United States of America and former reality TV star, offered this as his first thoughts on the shooting.
"Early reports not looking good."
That's what the president said after hearing that another ten lives had been needlessly lost in his country.
It's hard to fathom how two people, one of which is the most powerful person in the world and the other who was virtually unknown at the start of the year, could give such opposing statements - but here we are.
Trump did later offer more thoughtful words on what had happened.