TVTV NewsCoronation StreetSomeone on Coronation Street is hiding their true whereabouts on the night Theo Silverton was murdered, and all will be explained in a flashback next week on the ITV soap11:47, 21 May 2026Updated 11:50, 21 May 2026Someone on Coronation Street is hiding a "dark secret" the ITV soap has confirmed.‌It's not yet clear if it's an involvement in Theo Silverton's murder, but the mystery events certainly took place on the same night. It doesn't seem to be the killer reveal given we've already been told that that happens in late June or early July.‌Next week, an episode will reveal the secret in a flashback. We will find out what one character is hiding, with them lying about their whereabouts on the night Theo was killed.‌What the lie is and why they have told it will be confirmed in the episode next week. Spoilers reveal that as tensions run high and accusations continue, a witness lies to the police about their movements on the night of the murder.READ MORE: Coronation Street fans 'know' what Gary and Sarah are hiding and it's bad news for MariaREAD MORE: Emmerdale Dr Todd's downfall 'rumbled' as returning character 'to blame'We soon realise they are not being truthful, while it seems those on the street do not find out. We will be shown the true events, leading to a "dark secret" being exposed.‌A series of flashbacks show exactly what happened, what the mystery character saw and what they did. It's said the lie has formed a "complex web" of guilt and fear, as they cover their tracks.It's this fear that has led to them concealing the truth about what they were caught up in. So who is it, and what have they lied about?It comes as fans suspected they had rumbled Gary Windass and Sarah Platt's mystery behaviour. Amid questions surrounding Gary's alibi, with his partner Maria Connor lying for him, fans think Gary and Sarah might have slept together and could now be covering this up.‌The other theory is that one of them killed Theo and the other is covering up the crime. Taking to social media, one fan posted: "My latest theory is that Sarah saw Gary either leaving flat or on scaffolding and thinks he did it, but he actually just witnessed it."Still reckon it's either Danielle or their son." Another said: "I’ve had this random thought. I think that Gary killed Theo and it sets up an exit storyline for Mikey because he might be leaving… which kind of explains the NTA nomination??"‌A third fan commented: "Alright, I don’t think Sarah’s behaviour has anything to do with her head injury. She’s hiding something. I still think it’s an affair with Gary but honestly I can’t be sure."A further post read: "He might not have done it… but I think Gary may know who has," as another said: "Maybe she killed Theo with Gary's help." A fan then said: "Sarah acting erratic because she has to hide the fact that she and Gary are having an affair."Article continues belowCoronation Street airs weeknights at 8:30pm on ITV1 and ITV X. * Follow Mirror Celebs and TV on TikTok , Snapchat , Instagram , Twitter , Facebook , YouTube and Threads .Choose Daily Mirror as a 'Preferred Source' on Google News for quick access to the news you value.‌ITVCoronation StreetSoap operas