'How to Get Away with Murder' season 3 spoilers: Teaser introduces season 3 mystery

In less than a month, ABC's hit drama TV series "How to Get Away with Murder" will return to the small screen. Based on the recently released trailer, the show will once again take drama and the mystery to a whole new level.
In the second season finale, Wes (Alfred Enoch) finally unraveled the mystery of his mother's death. In addition, he learned that he is the illegitimate son of a wealthy businessman, Wallace (Adam Arkin). Wes also mustered up the courage to face his biological father. Just when Wes was about to confront his dad, Wallace was shot.
In the trailer for season 3, Wes was fuming as he belted out screams of anger and perhaps pain.
However, the most intriguing part of the clip was when Annalise (Viola Davis) resumed classes as if nothing strange happened, only to find a flyer with her face and the word "killer" posted on the classroom board. The same flyer had been reproduced multiple times and was spread all over the campus.
Who could be responsible for the threats? More importantly, who would want to go after Annalise? Recent speculations pointed fingers towards Wes, who had recently grown cautious around Annalise.
Another theory suggested that the accusations might have to something to do with Wallace's death. Perhaps someone will attempt to pin the blame on Annalise for the death of Wes' father.
When asked about the recent trailer, executive producer Pete Nowalk gave Entertainment Weekly a very general answer. "I won't tell you when, but we will find out who killed Wallace."
Moreover, FX News Call reported that a member of Keating's team might die next season.
"How to Get Away with Murder" will return to ABC for its third season on Thursday, Sept. 22, at 10 p.m. EDT.