UPDATE 1-Roger Ailes, former Fox News chief, dies -source

(Adds detail on Ailes)

May 18 (Reuters) - Roger Ailes, former chief executive of Fox News Channel, has died, a source told Reuters on Thursday.

Ailes resigned from Fox News last July following allegations of sexual harassment, marking an abrupt end to his 20-year rein over America's most lucrative and powerful cable news channel for conservatives.

Ailes was 77, according to Fox's website. (Editing by Alden Bentley and Bill Rigby)