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