Annalise Keating (Viola Davis) seems to be facing public prosecution in "How to Get Away with Murder" season 3.

Based on the trailer for the upcoming season, Annalise is planning to start the new school year at Middleton University as usual. As she tells them that she will train them to become full-fledged lawyers, her five closest students seem to be uneasy after they notice her photo on the board and all over the campus labelling as a killer.

This could mean that someone is out to damage her reputation. But who is the person responsible for the scandalous photos? Does one of the Keating Five have something to do with it?

Several speculations claim that Wes Gibbins (Alfred Enoch) was the one behind the mudslinging because he blames her for Wallace Mahoney's (Adam Arkin) murder. Since Wallace is Wes's father, he might want to retaliate for his death.

However, executive producer Peter Nowalk told Entertainment Weekly that fans of the series will soon uncover the mystery behind Wallace's death.

"I won't tell you when, but we will find out who killed Wallace," the executive producer said.

But actor Charlie Weber earlier told TVLine that he believes his character Frank Delfino could be capable of killing Wallace.

"It would certainly fit the story, but again I have no idea who pulled that trigger — or why. Wallace was a powerful man with a lot of enemies, and Frank is certainly one of them," Weber stated.

Meanwhile, Nowalk also revealed in a separate interview with TVLine that the third season of "How to Get Away with Murder" will deal with a different format compared to the second season.

"I like switching it up, honestly," he said. "I don't want the show to become stale. In the back half of Season 2, we had so much emphasis on Rose's case that there wasn't room for cases of the week. We'll probably try to do a balance."

"How to Get Away with Murder" season 3 premieres on ABC on Thursday, Sept. 22.