Stevie’s world has turned upside down in recent weeks (Picture: BBC / Metro) Casualty spoilers follow for Saturday’s (May 24) episode that is now available to view on BBC iPlayer. The episode in question will air on BBC One at 8:10pm. Stevie Nash ’s ( Elinor Lawless ) was left emotional after receiving a letter from the mother of a little boy whose life she saved. But it wasn’t just the kind words that led to her tears, but rather it was the mum’s mention of her colleague Kim Chang (Jasmine Bayes), who tragically died at the end of the last boxset. Medical resident Kim, as viewers will recall, had been taking weight-loss injections and suffered multi-organ failure in heartbreaking scenes. Her death had a devastating impact on those around her , particularly Stevie and fellow resident Matty Linlaker (Aron Julius). Stevie has also been struggling with pains and earlier this month, her prescription was unexpectedly changed to opioids. At first, she vowed to do without them – but a stressful day at the ED led her to take the drugs. Abigail, a young girl who was rescued by Teddy Gowan (Milo Clarke) from the Wyvern estate explosion, was treated by Stevie, who – after the opioidstook effect – administered too much morphine to the patient . To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Up Next Matty worked out what had transpired and confronted Stevie but he ultimately refrained from telling her what she did, instead taking the blame when confronted on it by Dylan Keogh ( William Beck ). But Dylan came to believe that Matty was at fault and, despite him being his son, contemplated reporting him. When he relayed the discovery to Stevie, she agreed that reporting him was the right call, unaware that she was the one to make the mistake. Matty subsequently told her of her error and, horrified, Stevie decided that she was going to own up. Unsuspecting Dylan, however, resolved to not report his son and, in light of her own discovery, Stevie kept shtum. Stevie was left unsettled to learn of her mistake with a patient (Picture: BBC STUDIOS) But the day in question proved difficult for her and, as her shift came to an end, she broke down reading the letter from the mother of a little boy named Oscar, who she had treated previously. ‘I thought you’d like to know he’s doing much better now’, read the letter. ‘I’ll never be able to repay you for what you did that day, especially Dr Chang. He would have died without her bravery.’ Don't miss a Soaps scoop! Add us as a Preferred Source As a loyal Metro Soaps reader, we want to make sure you never miss our articles when searching for stories. We have all the latest soaps news, spoilers, videos, and interviews, with a vibrant community of highly engaged readers. Click the button below and tick Metro.co.uk to ensure you see stories from us first in Google Search. Add us as a Preferred Source Now you can ensure you never miss a story from the Soaps team Reading the letter left Stevie devastated and thus she told Matty, who she’s been having a secret affair with, that she wanted to go home alone, instructing him to do the same. In subsequent scenes, she binned the opioids before heading home. Will Stevie open up about the impact her grief is having on her? Casualty airs Saturday at 8:10pm on BBC One or stream from 6am on BBC iPlayer. If you’ve got a soap or TV story, video or pictures get in touch by emailing us soaps@metro.co.uk – we’d love to hear from you. Join the community by leaving a comment below and stay updated on all things soaps on our homepage . Comments Add as preferred source