While there's been no word as to any specific situation or event that may have lead to the suicide, a HFPA member told Variety that "it wasn't because of the HFPA."
Miller had recently gone through a divorce and was battling depression says TheWrap.com. Though he was a current member of the association, he had someone else shooting photographs for him at the Golden Globes earlier this week.
In 2005, another HFPA member, Nick Douglas, committed suicide by hanging himself following a suspension for improperly selling a photo of himself and a celebrity - an action frowned upon by the Association. Douglas denied the allegations against him.