Four possible killers have their own reasons for wanting Tina - played by Michelle Keegan - out of the way, and 'Corrie' bosses have prepared four different showdowns that will be screened on the ITV soap's website.
The four main suspects are Peter Barlow, Carla Barlow, Tracy Barlow and Rob Donovan.
Suspect 1: Peter Barlow (played by Chris Gascoyne)
After his affair with Tina, might he try to get rid of her to preserve his relationship with Carla?
Gascoyne said: "Peter is a weak man who has made many, many mistakes in his time. Is he capable of murder? Well maybe if it was an accident.
"He really should make a clean break from Tina and the relationship in order to concentrate on rebuilding his relationship with Carla and prove to her that he will be a good father to their baby.
"But he gets to the stage where he lets Tina think they are going to run away together to Portsmouth, when he has no intention of doing that.
"Instead of just telling her he lets her pack her bags and even order the taxi and tells her he will meet her. But then she finds out Carla is pregnant and she threatens to tell Carla everything.
"Peter fears he is going to lose Carla and the baby, he never really loved Tina, he said he did but he didn't. Carla is the love of his life and he is desperate to save his marriage - getting rid of Tina could be the only option."
Suspect 2: Carla Barlow (played by Alison King)
Will the wronged wife try to wreak her revenge?
King said: "Carla has stuck by Peter through thick and thin and Tina has been her friend throughout it all - or so she thought. When she discovers the truth about Peter and Tina it will destroy her.
"There is no way Carla would not confront Tina - it is the first thing she would do. When Carla is angry there is no stopping her, she will feel betrayed by both Tina and Peter.
"She knows Peter is a weak man, she won't forgive that but the betrayal by Tina is different. She has confided in her and relied on her to help with Peter and Simon.
"Carla will want answers but when she confronts Tina emotions will be running high and hell hath no fury like a woman scorned."
Suspect 3: Rob Donovan (Marc Baylis)
Tina has been threatening to expose his dodgy financial dealings, and he has further cause to want her out of the way after learning she has had an affair with his sister Carla's husband.
Baylis says: "Ever since his brief fling with Tina, Rob has been very wary of her. He has managed to win Tracy back and their business is on the up, but he knows that Tina could bring it all crashing down.
"He has also had his suspicions about Tina and Peter and when he discovers the truth about their affair he is determined to make sure Tina doesn't tell Carla. As much as Rob doesn't think Peter is good enough for his sister, now that he knows she is pregnant he wants her to be happy.
"Rob is not someone who is afraid of confrontation and will be determined to try and persuade Tina to keep quiet about both the affair and what she knows about the business. If she refuses then who knows what could happen."
Suspect 3: Tracy Barlow (Tracy Ford)
Tina's arch-enemy, who has never forgiven her for trying to steal her man.
Ford said: "Tracy has committed murder before and got away with it and she certainly takes no prisoners when it comes to getting revenge on people who have wronged her.
"She has never really forgiven Tina for kissing Rob and trying to take him off her, and for her campaign to try and close down Barlow's Buys when they first opened.
"Now that she knows that Tina has rumbled their dodgy dealings with Tony, it may be that she thinks enough is enough and slips away from her engagement party to confront her - but Tina is every bit as feisty and Tracy might have bitten off more than she can chew trying to keep her quiet."