TORONTO – When you work on a show called “How To Get Away With Murder,” you pretty much have to prepare for the worst.

So says co-star Charlie Weber, whose shady character Frank Delfino revealed himself last season to be more than capable of tying up loose ends — permanently.

The legal thriller returns Thursday with Weber resuming his role as loyal bulldog to hard-bitten lawyer/professor Annalise Keating, played by recent Emmy winner Viola Davis.

The first season ended with the surprise murder of Rebecca Sutter, played by Canadian actress Katie Findlay, and Weber said fans won’t have to wait long to find out what happened.

“We are going to address the Rebecca thing fairly quickly, I think, and we’ll need to — a dead girl is under the stairs,” he said during a visit to Toronto in June.

“And we’ll see how quickly things pick up and where.”

A teaser for the second season opener promises the killer will be revealed.

Meanwhile, Annalise takes on the case of a brother and sister who are accused of killing their parents and an old friend surprises Annalise at home and teaches her a valuable lesson.

The episode also introduces Famke Janssen as a new character.

Weber said no character is safe on the Shondaland series — just one of several addictive Shonda Rhimes productions that include “Scandal,” which saw the death of Scott Foley’s Jake Ballard last season, and “Grey’s Anatomy,” which last season killed off popular hunk Derek Shepherd, played by Patrick Dempsey.

Weber said Findlay got little notice about her character’s fate.

“It’s quick. (Creator Pete Nowalk) told Katie Findlay, who plays Rebecca, that in fact she was going to be dead in the finale, but not long before that was finished. So he let her process that, but it can happen at a moment’s notice, on any one of those shows. For us, literally any moment because it’s a show about murder and we killed two series regulars in the first season.”

Weber said he’s eager to learn more about Frank’s dark past, noting that he only learned of his role in killing college student Lila Stangard as the series unfolded.

“A lot of decisions were made throughout the course of the season sort of leading down that path,” said Weber.

“I think it was actually quite validating, that moment of Frank killing Lila, for the way that I’d played Frank from the beginning. He was definitely someone capable of that and (she was) definitely not the first person he’d killed. But now we need to find out why.”

“How to Get Away with Murder” returns Thursday on ABC and CTV.