Fans around the world were saddened to learn that the premiere of “Sherlock” season 4, set to begin production in spring of this year, has been pushed back to 2017, according to Christian Today. However, grim and devastating events are set to shock fans of Sherlock once the fourth season airs, one of which could be Mary Morstan’s (Amanda Abbington) death.

Though no plot details have been announced yet, actor Martin Freeman, who plays Sherlock’s friend Dr. John Watson in the TV show, said Mary could be killed off in line with Conan Doyle’s stories.

“While we play fast and loose with the original stories, we generally follow the trajectory of what Conan Doyle did,” Freeman had told The Telegraph. “So he [Watson] gets married and then Mary dies – so at some point presumably she’ll die.”

In Conan Doyle’s storyline, she died at an unspecified point between “The Final Problem” and “The Adventure of the Empty House,” and her passing is mentioned briefly by Holmes in the latter.

However, “Sherlock” Season 3 saw John and Mary expecting a baby. Perhaps Mary will not die just yet.

“Just because it’s in the stories doesn’t mean it’ll happen in the series because there’s an awful lot of changes and an awful lot of places to go and things to do,” Mark Gatiss had told RadioTimes.

Her, death, if it is to occur, could be part of the “consequences” Steven Moffat said Season 4 will explore, in an interview to Entertainment Weekly.

“It’s dark in some ways—obviously it’s great fun and a Sherlock Holmes romp and all that—but there’s a sense of … things … coming back to bite you,” Moffat said. “It’s not a safe, sensible way to live. It’s hilarious and exhilarating some days, but some days it’s going to be bloody frightening,” he added.

Moffat, who is to bow out of “Doctor Who” after Season 10, also says in the interview that season 4 will be more emotional and intense than the preceding ones. Moffat added that fans will be “desperate for series 5,” after watching Season 4.”

“We’re certainly going to put them through the mill,” he said about viewers. He also added that Season 4 will be a “tougher series.”

More details are expected to emerge as production begins for “Sherlock” season 4.