This was the reporter that actually broke the news.
http://www.pulitzer.org/article/merriman-smiths-account-jfks-assassination
Merriman Smiths account of JFKs assassination
At 12:34 p.m. Central time, four minutes after the shooting, UPIs A-wire clattered out the first news of the assassination:
DALLAS, NOV. 22 (UPI) THREE SHOTS FIRED AT PRESIDENT KENNEDYS MOTORCADE TODAY IN DOWNTOWN DALLAS.
Back then, they couldn’t even show Cronkite at first, because it took a half an hour for the camera to warm up enough, they just had his voice over a static screen.
Thanks for the info.