Liam, played by Rob James-Collier, will be bumped off by Tony Gordon (Gray O’Brien), after he discovers that Liam has been cheating with his fiancee, Carla (Alison King).
Three death scenes have been filmed and the two alternative endings will be posted online on October 17 after the episode is shown on ITV1, according to reports in Broadcast magazine.
Behind-the-scenes footage of the alternative murder plots will also be available on the site.
In the week that Liam is killed, all five episodes of the soap will be based around one 24-hour period – a first for the drama.
ITV is committed to offering multi-platform content, and an ITV spokeswoman said that the additional sequences would enable fans to “delve deeper into the world of Coronation Street”.
She said: “Everyone knows who will murder Liam, but we wanted to draw the mystery out of how he did it.
“Each of the endings is plausible, with the same repercussions for Carla, Liam’s wife Maria and Tony.”