Opening the case on Tuesday, Mr Bennetts QC said: “There is no dispute that he killed Molly McLaren.”In certain circumstances the charge of murder can be reduced to manslaughter. In this case the defence will assert that it should be.”The defendant has pleaded guilty to the manslaughter of Molly McLaren. The plea is on the basis that at the time of the killing Joshua Stimpson was suffering from diminished responsibility. The prosecution does not accept that he was.” Molly McLaren ended her relationship with Joshua Stimpson about two weeks before she diedCredit:Kent Police/PA Jurors at Maidstone Crown Court saw CCTV footage on Wednesday of Ms McLaren working out at a PureGym in the retail outlet.They saw Stimpson arrive shortly after and put his exercise mat near hers. Molly McLaren’s Citroen C2 at the scene of her stabbing in ChathamCredit:Kent Police/PA Joshua Stimpson arriving at PureGym in the Dockside retail outlet, ChathamCredit:Kent Police/PA Jurors were shown a CCTV image of Stimpson in Asda in Chatham, buying a Sabatier paring knife at around 5pm on June 27.About half an hour later he bought a Saxon pickaxe from Homebase further along the road. The knife was the same one used to kill her two days later, Mr Bennetts said.The court heard how the pair’s relationship became strained and Ms McLaren told friends she faced a “dilemma” as she found herself no longer attracted to Stimpson. Joshua Stimpson, left, was covered in blood when he was arrested after stabbing Molly McLarenCredit:Kent Police/PA and Facebook After getting in her car, she was stabbed to death by Stimpson, who the court heard had bought a knife in an Asda store two days before the attack. Joshua Stimpson being arrested at the Dockside retail outlet in ChathamCredit:Kent Police/PA Her mother told her to go straight home. On a night out on June 17 in Maidstone, Ms McLaren took Stimpson to one side and broke up with him.The next day he told her she could have done it in a more “respectful way”, the court heard. Joshua Stimpson pictured on CCTV buying a knife at Asda in ChathamCredit:Kent Police/PA Images of a man in a blood-stained top moments after he stabbed his ex-girlfriend to death has been shown to a jury.Joshua Stimpson carried out a frenzied attack on Molly McLaren with a kitchen knife as she sat in her car on June 29 last year.Covered in blood, the 26-year-old was arrested shortly afterwards in the car park at the Dockside retail outlet in Chatham, Kent.The pair had been in a seven-month relationship after meeting on Tinder, but she ended it about two weeks before she died when they began to have problems, the court heard. Stimpson admits manslaughter but denies murder, arguing diminished responsibility.Prosecutor Philip Bennetts QC argued Stimpson had “carefully considered the execution of Molly” and said he was “following her movements, waiting for the moment that he has chosen to kill her”. In text messages read to the court, Ms McLaren described his behaviour as “childish” and that she felt like she was “constantly treading on egg shells” around him, adding: “It’s just pathetic. I just feel really pressured with you at the moment if I’m honest.” They were then played body camera footage from police officers who arrived at the scene and saw Stimpson covered in blood.The court heard on Tuesday that at 10.45am Ms McLaren texted her mother saying: “Mum he’s turned up at the gym and come next to me”, before phoning her. He put his exercise mat near ex-girlfriend Molly McLaren’sCredit:Kent Police/PA Mr Bennetts said Stimpson was “angry” with the break-up and described him as “rather demanding”. He said Ms McLaren was frequently trying to put things right.After they split up, Stimpson posted derogatory comments and photographs about Ms McLaren on Facebook, including claims she was taking drugs, the court heard.The trial, expected to last two weeks, continues. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.