It's the question that gripped the nation for weeks - is Julia Montague still alive?
And despite the Bodyguard finale seeming to put an end to this theory, some viewers have claimed they spotted Julia (Keeley Hawes) in one of the scenes on Sunday's episode.
With the series creator Jed Mercurio claiming there could now be as many as four seasons of the hit show - which was initially intended to be a stand-alone series - fans are claiming that the sighting of a brunette women at the window could mean Julia will be making a big return.
Home Secretary Julia was killed by a bomb in episode three of the six-part series, yet many viewers believed this was a ruse as we did not see her body.
Now several fans have claimed to have spotted Julia during Sunday's series finale, saying that she was the brunette women at the window when David Budd (Richard Madden) confronted Chief Superintendent Lorraine Craddock (Pippa Haywood) and crime boss Luke Aitkens (Matt Stokoe).
Taking to Twitter, they posted: 'Is Julia at that window'; 'So, like, who was in the upstairs window in Craddock's house? I was certain it was Julia and when Gina McKee said to David "there's something you need first" she was going to come strutting through the door. Also the car shoulda blown up at the end. #Bodyguard'.
'Did I just see Julia In the window? #Bodyguard'; 'Where the f**k is Julia montague??? Who was at the window ? I want to find out more !! Hoping for #series2 #Bodyguard'
'In the scene with Luke and Lorraine... Did anyone else think the person at the window above the garage might be Julia? #Bodyguard'; 'Julia was at the window. Series 2 on the cards? #bodyguard'.
Not all were convinced, however, with one user posting: 'All the people tweeting that they thought they saw Julia Montague in the window in the last episode of the #bodyguard I'm not being funny but if that's the case you'd think they'd have used her actual face if that was the case, looks nothing like her.'
MailOnline has contacted a BBC spokesperson for comment.
Whilst the woman in question appears to be another actress, fans won't know for sure if Julia is set to return unless a second season of the hit show is commissioned.
However, show creator Jed Mercurio recently revealed the show could potentially continue.
Speaking to The Sun, he said: 'It's probably fair to say we would probably approach any thoughts of a second series with the idea that it would create an opportunity for a third or fourth.'
He also explained that he wrote the series intending there to only be one season, and that's why all the loose ends were tied up by the end.
Jed revealed: 'If the ratings hadn't been quite so high, then possibly everybody involved including the BBC would have said, "Well that was a nice little series but we're just going to leave it at that and there won't be any more".
'So you are a hostage to fortune in that sense. And we do feel very privileged and fortunate that there's been such a response that it gives us that opportunity to at least think about doing more.'
Even if he wants to do more with Bodyguard though, Jed was quick to admit that it wouldn't happen until he has finished filming Line Of Duty series five.
The writer even revealed that he wouldn't start working on a new series of the intense BBC drama until mid 2019, as he is currently working in Belfast on Line Of Duty until Christmas.
He admitted he wasn't even 'going to speculate on that' because various factors like the script, production schedule, and 'a whole bunch of things' would come into play.