The New York Times
The Pulitzer Prize-winning journalist was on assignment in eastern Syria, without the government's knowledge, when he apparently died of an asthma attack. Times photojournalist Tyler Hicks, who along with Shadid was kidnapped during the Libyan revolution last year, carried his body into Turkey. The Times reports:

The exact circumstances of Mr. Shadid’s death and his precise location inside Syria when it happened were not immediately clear.

But Mr. Hicks said that Mr. Shadid, who had asthma and had carried medication with him, began to show symptoms early Thursday, and the symptoms escalated into what became a fatal attack. Mr. Hicks telephoned his editors at The Times, and a few hours later he was able to take Mr. Shadid’s body into Turkey.

The Times obituary describes the dangerous nature of Shadid's work: (more...)