In the finale of the thrilling three-part series, which saw Rachel Bailey (Suranne Jones) nearly killed by a serial killer.
The series appeared to tie up all loose ends as the pregnant police officer decided to keep her baby and remain in her current job in Manchester.
Meanwhile her colleague Janet Scott (Lesley Sharp) interfered in her daughter's indecent images charges.
Earlier this month it was revealed that the drama, which pulled in more than five million viewers when the final series began, would end as bosses reportedly wanted it to "bow out at the top" rather than see ratings fall.
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Suranne, who also produced the show, previously told Radio Times: "We knew we were saying goodbye, so not it's out there.
"Well, it's good I think. It's good to move on."
But many fans were outraged that the popular programme had come to an end with many taking to Twitter to express their disappointment that it won't return.
One user tweeted: "This is just a joke. I don't get why it's the last ever one."
While another wrote: "What?! That was the LAST EVER #ScottAndBailey?? This three-parter had its flaw, but still so much potential!"
Another added: "#ScottandBailey best thing on TV. So sad something that shows strong women within family and job roles coming to an end."
Others simply stated they were devastated it had aired for the final time, with one viewer tweeting: "Gutted it's finished".
Another commented: "Can't believe this is the last Scott & Bailey, I'm so sad."