A fourth major broadcast network and actor Jake Gyllenhaal (JIHL'-ihn-hahl) are adding their support to the ambitious fundraiser "Stand Up to Cancer."
Fox TV will join previously announced ABC, CBS and NBC in donating a simultaneous commercial-free hour of prime-time for the September telethon airing from Los Angeles.
Gyllenhaal will appear in a "Stand Up to Cancer" public service announcement set to debut during Major League Baseball's All-Star Game airing Tuesday evening on Fox.
More cable networks also have agreed to carry the fundraiser, with VH1, HBO Latino, TV1 and G4 joining previously announced HBO, Discovery Health, MLB Network, E! and the Style Network.
"Stand Up to Cancer," to be hosted by Katie Couric, Diane Sawyer and Brian Williams, will air Sept. 10.
© Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.