A news headline: why "die Thursday" not "die on Thursday"?

[SiamS]

(CNN) -- Michael Jackson, the show-stopping singer whose best-selling albums -- including "Off the Wall," "Thriller" and "Bad" -- and electrifying stage presence made him one of the most popular artists of all time, died Thursday, CNN has confirmed.

Anybody knows why "die Thursday" not "die on Thursday"? :?

Thanks,
Siam

[Alan]

Hi,

There is a fashion in news bulletins to provide information in the shortest way possible. That's why 'on' is missing. It's similar to a conversational style as when you say good bye to someone: Bye for now, see you (on) Tuesday.

Alan
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[SiamS]

Hi Alan,
Thanks so much for revising the head line and also the quick reply. So I could not find the answer on any grammar book. :)
Many thanks,
Siam