A killer who researched "the best way to get revenge on a woman" before he stabbed his new girlfriend to death was filmed on his own mother's dash cam throwing blood-stained knives into a canal.
Ian Bennett, 38, knifed Kerry Woolley, also 38, to death at her flat in Olton, Solihull, West Midlands, on July 12 last year after falsely accusing her of sleeping with another woman.
A post mortem revealed that Ms Woolley had suffered more than 50 knife wounds, most inflicted on her neck.
Bennett then roped his mother Lynda Bennett, 63, into a cowardly plot to help him conceal the crime. She drove him to a canal bridge to dispose of the murder weapons.
But the plan backfired when dash cam footage from her own car helped convict the pair in court.
Other evidence found on Bennett's phone found that he had researched: "The best way to get revenge on a woman".
Bennett, of Solihull, was found guilty of murder at Birmingham Crown Court and was jailed for life and ordered to serve a minimum of 25 years.
His mother Lynda was convicted of assisting an offender and perverting the course of justice was sentenced to three years in prison.
The court was told how Bennett had called 999 on the afternoon of the murder, telling officers he had found mum-of-two Kerry with catastrophic wounds to her neck.
He claimed he had left the flat in the early hours of July 12 and had then been unable to get back in contact with Kerry.
Police bodycam footage captured Bennett's crocodile tears as he tells cops: "I've been trying to call and ring her all day, no answers.
"So I thought I'd knock on. The door wasn't open so I had to pull the handle and then I walked into that...found her dead."
He then points at the door and sobs: "It's horrific."
Although initially no weapon could be located Bennett was arrested on suspicion of murder.
His mum was also captured on camera calmly arriving at the scene to ask police why her son was being arrested despite knowing full well what had happened.
At one point she even laughs when an officer tells her Bennett is being taken to a station in Coventry and she scoffs: "I don't know how to get to Coventry."
Officers analysed text messages between the couple, who only met a few weeks before, which suggested there had been a falling out a couple of days earlier.
Bennett appeared to be angry, accusing Kerry of cheating on him, although this was groundless, and that she was also messaging a former partner.
Mobile phone data also revealed that both Bennett's and Kerry's phones went 'silent' around 11.30pm on July 11, despite being in regular contact previously.
Bennett's phone did become active again at 3.54am, when he made attempts to contact her, knowing that she was in fact already dead.
A dashcam in Lynda's car revealed it had left the address Bennett shared with his parents and took a 40 minute journey round Solihull.
Cell site data retrieved from her phone was consistent with Lynda being the driver of the car.
The vehicle firstly stopped on Damson Lane, where CCTV footage clearly showed Bennett throwing a bundle into the canal.
A large knife with a bent blade was later recovered during a search of the water.
The car then stopped near shops at Prospect Lane, and again CCTV picked up Bennett, carrying a plastic bag into parkland before returning to the car without the bag.
Another search of the park land resulted in a bag being recovered and inside were blood-stained women's jogging bottoms and a pair of oven gloves.
Forensic examinations later matched Sarah's DNA to both the knife from the canal and the blood-stained items found in the park.
Two knives had been used, one with a serrated blade, the second with a smooth blade.
