Rosemarie Colvin says her daughter Marie was planning to leave Syria Tuesday but stayed to finish a story she was working on.

"She had a story she felt was very important," Rosemarie Colvin said, adding: "She would take one more day." ...

"She was absolutely dedicated to doing what she did at the highest level ... It's the way she always was. Even when she was young she marched to her own tune ... She was totally dedicated to getting the story straight and getting it out."

Colvin, who died overnight in Syria while reporting for The Sunday Times, graduated from Long Island's Oyster Bay High School and attended Yale.

Related: 6 journalists have been killed in Syria in the last few months | UK politicians pay tribute to Colvin | Is Syria targeting journalists? | Colvin's final story has been published by the Times (The Sunday Times) | Are foreign correspondents like Colvin & Shadid a vanishing breed? (Poynter) | Marie Colvin killed in Syria, other journalists wounded overnight (Poynter).