It is called showing respect. Show some fucking respect to the numerous transgendered individuals on this forum that have not yet physically transitioned or are still in the process.
If someone defines themselves as female, use the proper pronouns for them. If your friend came out to you and said they identified as female, would you honestly go "sorry dude, no you aren't until you get surgery?"
Yes, people who don't know that person's situation will get the gender wrong based purely off appearance. Not sure how that applies here when we do know how the details.
Is the debate closed on this? The article listed in the OP refers to this guy as 'Mr. Kosilek' and uses the pronouns 'he', 'his', and 'him'. I understand some may have different standards of etiquette, but can said standards be considered universal if the goddamn Wall Street Journal doesn't comply with them?
Anyway, we're talking about a murderer, not Biznik's friend.