Latest News and Blogs

15 September 16

KFS plays major role in conviction of obsessive murderer and accomplice.

On a cold evening in early 2016, businesswoman Sadie Hartley returned home after tending her horse. A short time later, she was dead - attacked with a 500,000-volt stun gun and stabbed by love rival Sarah Williams, a ski instructor.

Ms Hartley was found by police the following night, 15 January, face down in a pool of blood following an act described in Preston Crown Court as "uncontrolled butchery".

Sarah Williams, 35, stunned Sadie Hartley with the stun gun and inflicted more than 50 injuries in an "orgy of violence".

Aided by her accomplice Katrina Walsh, she attacked Ms Hartley, 60, at her home in Helmshore, Lancashire, in a bid to win back ex-lover Ian Johnston.

Williams and Walsh travelled to Germany to buy the stun gun in December 2015 and, exactly a week before Ms Hartley was murdered, Walsh delivered flowers to her door in a dry run for their plans.

KFS scientists played an instrumental part in providing compelling evidence that Williams had committed the murder. DNA matching the DNA profile of Sadie Hartley was obtained from traces of blood staining found on the bath at the home address of Williams. Blood staining found on a pair of spectacles recovered from Sarah Williams’s vehicle, and blood staining found in a Renault Clio motor vehicle used on the night of the incident matched the DNA profile of Sadie Hartley.

The stun gun and knife which had been used in the murder were concealed in a field by Katrina Walsh, DNA matching Sadie Hartley was found on the stun gun.

Williams and her accomplice Katrina Walsh, 56, were both found guilty of murder and given life sentences.

News archive

US Police Departments are now realising the full benefits of RapidHIT® technology.

Watch the latest news coverage featuring Bensalem PD in Delaware   ⇓

Right People. Delivering Results.

Experienced scientists delivering forensic effectiveness, unquestionable integrity, focused customer service and value for money from one of the UK's leading Forensic Companies.

Cyber Essentials



“I believe Key Forensic Services have provided us with a reliable, timely and cost-effective service for our DNA and Documents work.”