The soap's current storyline sees detectives on the search for the culprit who left Robert fighting for his life after receiving a bullet in the chest.
Michael, who plays Ross Barton, spoke to Reveal about the dramatic storyline at this week's Inside Soap Awards 2015 sponsored by Dream Bingo.
"Ross has a bit of a killer instinct in him but what motivation does he have for shooting Robert?", Michael ponders, before joking: "I think it was Edna personally. She lives her life by the book, and she has those crazy little aggressive dogs.
"I've seen the way she dresses in those bad ass clothes and she sells drugs as well. It's Edna, yes!"
Ross recently fled the village after being rejected by Debbie Dingle and having a bitter showdown with his brother Pete. Before leaving, however, Ross got rid of the firearm he tried to shoot Pete with by ditching it in the river.
The gun was later recovered by Lachlan, who was then spotted holding it by Rakesh, but will the gun be traced back to Ross?
Whoever it is or isn't, will be unveiled during a hour-long rewind episode at the end of this month to tie in with the soap's 43rd birthday.
Viewers will learn who shot Robert, and also find out two other big secrets that will pave the way for the soap's winter storylines.
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