Home > Case Book > Forensic Cases: The Murder of Leanne Tiernan

Forensic Cases: The Murder of Leanne Tiernan

By: Suzanne Elvidge BSc (hons), MSc - Updated: 19 Mar 2016 |
Forensic Cases: The Murder Of Leanne Tiernan

In August 2001, a man walking his dog in Lindley Woods, near Otley, in West Yorkshire, found the body of 16-year old Leanne Tiernan, buried in a shallow grave. This was about ten miles from her home in Landseer Mount, Bramley, Leeds. She had been walking home from a Christmas shopping trip with her best friend in November 2000 when she disappeared.

How she was found

She had a black plastic bag over her head, held in place with a dog collar, with a scarf and cable tie around her neck, and cable ties holding her wrists together. Her murderer had then wrapped her body in green plastic bin liners tied with twine.

In the largest search in West Yorkshire, the police searched around 800 houses and 1500 gardens, outbuildings and sheds on her route from the bus stop to her house, as well as searches of a three-mile stretch of canal, drain shafts and moor land.

Length of time since her death

The pathologist examining her body said that it had not been there since November. She had been strangled and her body stored at low temperatures in the intervening time.

The Dog Collar, The Twine And The Cable Ties

Police tracked down suppliers of the dog collar and found that a man from Bramley had bought several similar to the one found around Leanne Tiernan’s neck. His name was John Taylor, and he was a poacher who had been seen around the woods where the body was found.

The twine was an unusual kind, used for rabbit netting, and was tracked down to a supplier in Devon, which had only produced one batch. It matched twine found in John Taylor’s home.

Some of the cable ties used on Leanne Tiernan were of a type used almost exclusively by the Royal Mail, the patent company of John Taylor’s employer, Parcel Force. When the police searched John Taylor’s house they found more of the cable ties and one of the dog collars.

DNA examination

Police searched the woods and recovered around 400 items, including cans and magazines, and forensic scientists compared DNA samples from these, the duvet cover and the bin bags with samples from friends, family, residents on the council estate where Leanne lived, and known sex offenders.

Hairs found in the scarf

The scarf tied around Leanne Tiernan’s neck had a few hairs caught in the knot. Unfortunately, there was not sufficient DNA in the roots for standard DNA profiling. However, the scientists found very small amounts of DNA in the hair shaft and used mitochondrial DNA testing to match it to John Taylor.

First British murder investigation using dog DNA profiling

There were dog hairs on Leanne Tiernan’s body, and scientists in Texas produced a partial dog DNA profile – this was the first time a British murder investigation had used dog DNA profiling. However, John Taylor’s dog had died, so this could not be used in evidence.

The carpet and bloodstains under floorboards

Forensic scientists found a strand of pink carpet fibre on her clothes, with specific patterns of dye. Though John Taylor had destroyed the carpet by burning it, police found strands around a nail that matched the fibre on her jumper. Searching under the floorboards, police found bloodstains that the forensic scientists identified as belonging to Leanne Tiernan.

The arrest

John Taylor was arrested in October 2001, and sentenced to two life sentences in July 2002. In February 2003, he was convicted of two rapes, based on DNA evidence, and given two additional life sentences.

Now find out more

To find out more about the various forensic principles used in this investigation, read the following:

Read about more forensic cases in our casebook category.

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[Add a Comment]
This is probably one of the easiest murder case studies I have read. Of course it was John Taylor.
Poppie - 19-Mar-16 @ 3:26 PM
He was a sick n twisted man me n my mum visited hos house not knowing at the time her body was in the freezer he also took us for walks in the woods where her body was found ....a necklace of one of the girls hw murdered he gave to my mum as a gift ....i was the same ag was as the girls at this time ...makes me think was I his next victim....he had a daughter too so how could he do this!!
klh83 - 9-Mar-16 @ 1:13 PM
I facking hate these facking neegers.
Xxc0kSuKeR69xX - 22-Sep-15 @ 5:25 PM
i thought this was an excellent piece. i thought it showed how well you can investigate your crimes. well done dr willybum out
sexybum69 - 18-Sep-15 @ 4:40 AM
I'm sorry I just have to ask.....do you people really think they took the dogs DNA because the dog might have killed her?? I think you all are joking around and I must be getting punked.... If you are serious I will gladly explain
harmsgrandma - 15-Aug-15 @ 10:12 PM
@Johndoe Yes the DNA is traceable even after the death.....but as i have studied it is traceable for a particular period of time....so its dependent on after how many days the dog's dead body was recoverd or forensic experts came to know that dog is dead
Chong - 26-Jul-15 @ 4:37 PM
Just watched this case on forensic files. interesting case so I Googled it haha
rrrrrrrr - 17-May-15 @ 10:08 AM
So technically John Taylor was sentenced to 4 life sentences What is the point of this?
jjjjjjjjjjjjjjjjjjjj - 5-May-15 @ 10:17 AM
I think this is an awesome case!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
jjjjjjjjjjjjjjjjjjjj - 5-May-15 @ 4:00 AM
@sundgun - if you do an online search you should be able to find more information on this case and the information you require regarding the arrest. I hope this helps.
ExploreForensics - 11-Feb-15 @ 1:48 PM
how was the arrest made?? please answer this question, i really need this for my assignment..
sundgun - 11-Feb-15 @ 2:10 AM
I thought that DNA is still traceable even when the person is dead. So, why wasn't the dog's DNA any use to the forensics team?
JohnDoe - 4-Feb-15 @ 9:17 PM
Science is the dope way to curb sophisticated criminals
LeRue Mukudzei - 12-Dec-14 @ 9:07 AM
@Eve they used the dog DNA to track the dog and by doing that it will lead it to the owner
jack - 3-Dec-14 @ 3:55 PM
What's the reason behind this murder? I want some more cases study if possible.
Esther - 3-Dec-14 @ 7:44 AM
Well done to the police and the experts who, using the instrments of their trade, they were able to tie the mans dog to the girl in the bag.
bernie - 3-Apr-14 @ 7:17 PM
I think the purpose of having the dogs' DNA identified was to match it to the suspects dog, if it was alive,this would act as collaborating evidence to show that indeed Leanne could have been linked to the suspect...
Dunford - 23-Feb-14 @ 9:28 AM
this case has to be one messed up case, mean she was christmas shopping and then kidnapped, with dog hair one her body.
Mn - 13-Jan-14 @ 4:39 PM
So she was gone for a year before she was found? Why didnt anybody look for her?
Chickieboo - 13-Jan-14 @ 4:38 PM
@Eve....Although the dog may not have killed the girl dog hairs still have DNA in them and can be matched to either the victims dog or the killers dog or another that either the victim or suspect may have come into contact with. It's honestly not irrelevant at all as it could have been used in the case if the killers dog had not of died. If the dog hairs that were found on the girl had been matched to the killers dog they would have been used in the case and another piece of direct evidence. -Mystic
Mystic - 22-Dec-13 @ 11:45 PM
Why would they do dog DNA tests? It's pretty obvious that the dog didn't kill her, so that would be irrelevant. Plus she was found in the woods, where probably lots of dogs wlk anyways.
Eve - 17-Sep-13 @ 7:23 PM
good thing that they got ahold of him.
kraz3e - 21-Apr-13 @ 8:27 PM
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