How A Hoax About Omar Mateen Telling His Wife He's Gay Went Viral In Spanish
It originated in English on a fake news website.
It appears that El Mundo, a major newspaper in Spain, was the first to fall for the hoax. It published a story that attributed the information to the real ABC News. The paper also translated many of the details from the fake story.
A some point on Wednesday it must have realized its mistake, as the story has been completely removed from its website. But an archived version is available here.
El Mundo