Spoilers follow for Line of Duty series six, episode five...
After meeting with Davidson, Fleming engaged in an armed standoff with the OCG-linked police officer Ryan Pilkington (Gregory Piper).
Watch: Martin Compston shares Line of Duty pranks with co-star Vicky McClure
The screen then cuts to black, and two gunshots are heard, but the fate of all three characters is unclear.
Several Line of Duty fans had spotted that McClure’s name was not included on the cast list for episode six, fearing that the omission could spell grave news for the character’s future.
“Mother of god. Vicky McClure isn’t on the castlist in next week’s episode on Radio Times. That doesn’t bode well,” wrote one viewer.
“She’s a goner isn’t she,” wrote someone else. “Castlist suggests so.”
“I feel sick,” wrote another fan.
Alongside McClure, however, the cast list is also missing Macdonald and Piper’s names, suggesting that the BBC is simply playing its cards close to its chest and refusing to give viewers any clear hints via the cast listing.
Some fans, meanwhile, are convinced that Fleming will survive the shoot-out, based on an as-yet-unseen clip of the character which was featured in a trailer for the series.
However, it’s possible that the clip was included in the trailer as a deliberate mislead.
Line of Duty continues at 9pm on Sunday on BBC One.
Watch: Line of Duty Series 6 teaser