DNA profiling used to track rapist

Investigators tracking the Night Stalker used cutting-edge techniques to try to build a picture of the man from his DNA.

Several samples were recovered from attacks but because Delroy Grant was not on the DNA database police could never identify him.



This was despite the fact he had a significant criminal history, with convictions including attempted robbery and handling stolen goods.



As a result, police turned to a company based in Florida to help them build a picture of their suspect's ancestry.



The value of the expensive lab work and analysis remains disputed, even among detectives.



Scientists found Grant was of Caribbean origin and further work claimed his ancestors probably came from the Windward Islands.



After his arrest, police found Grant was Jamaican and have yet to find any links to the Windward Islands.



Eight police officers travelled to the chain of Caribbean islands, which include Trinidad, Tobago, St Lucia and St Vincent, as part of the inquiry.



Detective Superintendent Simon Morgan, who led the inquiry from 2001, said police focused on the DNA as victims gave limited and conflicting descriptions of Grant.



He said: "We kept up to pace with the world of science and technology that was developing DNA analysis and looked at what this could tell us about this offender.



"A sample was sent to Florida for ancestral analysis. The results were blind tested by experts in the UK. At the time, a limited number of experts existed in the world.



"They agreed that the interpretation of the analysis that his ancestry from five generations previously was Caribbean.



"This was effectively the time of the America slave trade. A mathematical presumption was that his ancestors were from the Windward Islands in the southern Caribbean.



"We now know he was born in Jamaica but we do not know his ancestry. The benefit of this ancestral work is that we were able to rule out thousands of individuals of African origin that were clearly not our priority."



Meanwhile, a move to collect DNA samples from more than 3,000 suspects sparked controversy and resentment among the black community.



Senior officers later admitted that the voluntary DNA testing did little to further the inquiry as 5,200 potential suspects remained on the system.



As the investigation went on police were swamped with information as they amassed details of 27,000 people on their database.



Police saw a similar lack of success with a steady stream of profilers and criminal psychologists brought in to give an insight into his lifestyle.

Arts and Entertainment
Sydney and Melbourne are locked in a row over giant milk crates
art
News
Kenny Ireland, pictured in 2010.
peopleActor, from House of Cards and Benidorm, was 68
News
A scene from the video shows students mock rioting
newsEnd-of-year leaver's YouTube film features staging of a playground gun massacre
Travel
travel
News
ebookA unique anthology of reporting and analysis of a crucial period of history
Voices
A family sit and enjoy a quiet train journey
voicesForcing us to overhear dull phone conversations is an offensive act, says Simon Kelner
News
i100This Instagram photo does not prove Russian army is in Ukraine
News
Morrissey pictured in 2013
people
Sport
sportVan Gaal has £500,000 video surveillance system installed to monitor Manchester United players
Environment
View from the Llanberis Track to the mountain lake Llyn
Du’r Arddu
environmentA large chunk of Mount Snowdon, in north Wales, is up for sale
Life and Style
Martha Stewart wrote an opinion column for Time magazine this week titled “Why I Love My Drone”
lifeLifestyle guru Martha Stewart reveals she has flying robot... to take photos of her farm
Arts and Entertainment
The Secret Cinema performance of Back to the Future has been cancelled again
filmReview: Sometimes the immersive experience was so good it blurred the line between fiction and reality
News
i100
Life and Style
The director of Wall-E Andrew Stanton with Angus MacLane's Lego model
gadgetsDesign made in Pixar animator’s spare time could get retail release
News
peopleGuitarist, who played with Aerosmith, Lou Reed and Alice Cooper among others, was 71
Environment
Tyred out: should fair weather cyclists have a separate slow lane?
environmentFormer Labour minister demands 'pootling lanes' for women cyclists
News
people
Latest stories from i100
Have you tried new the Independent Digital Edition apps?

Day In a Page

Dress the Gaza situation up all you like, but the truth hurts

Robert Fisk on Gaza conflict

Dress the situation up all you like, but the truth hurts
Save the tiger: Tiger, tiger burning less brightly as numbers plummet

Tiger, tiger burning less brightly

When William Blake wrote his famous poem there were probably more than 100,000 tigers in the wild. These days they probably number around 3,200
5 News's Andy Bell retraces his grandfather's steps on the First World War battlefields

In grandfather's footsteps

5 News's political editor Andy Bell only knows his grandfather from the compelling diary he kept during WWI. But when he returned to the killing fields where Edwin Vaughan suffered so much, his ancestor came to life
Lifestyle guru Martha Stewart reveals she has flying robot ... to take photos of her farm

Martha Stewart has flying robot

The lifestyle guru used the drone to get a bird's eye view her 153-acre farm in Bedford, New York
Former Labour minister Meg Hillier has demanded 'pootling lanes' for women cyclists

Do women cyclists need 'pootling lanes'?

Simon Usborne (who's more of a hurtler) explains why winning the space race is key to happy riding
A tale of two presidents: George W Bush downs his paintbrush to pen father’s life story

A tale of two presidents

George W Bush downs his paintbrush to pen father’s life story
Restaurateur Mitch Tonks has given the Great Western Pullman dining car a makeover

The dining car makes a comeback

Restaurateur Mitch Tonks has given the Great Western Pullman dining car a makeover
Gallery rage: How are institutions tackling the discomfort of overcrowding this summer?

Gallery rage

How are institutions tackling the discomfort of overcrowding this summer?
Louis van Gaal has £500,000 video surveillance system installed to monitor Manchester United players

Eye on the prize

Louis van Gaal has £500,000 video surveillance system installed to monitor Manchester United players
Women's rugby: Tamara Taylor adds fuel to the ire in quest to land World Cup

Women's rugby

Tamara Taylor adds fuel to the ire in quest to land World Cup
Save the tiger: The day America’s love of backyard tigers led to a horrific bloodbath

The day America’s love of backyard tigers led to a horrific bloodbath

With only six per cent of the US population of these amazing big cats held in zoos, the Zanesville incident in 2011 was inevitable
Samuel Beckett's biographer reveals secrets of the writer's time as a French Resistance spy

How Samuel Beckett became a French Resistance spy

As this year's Samuel Beckett festival opens in Enniskillen, James Knowlson, recalls how the Irish writer risked his life for liberty and narrowly escaped capture by the Gestapo
We will remember them: relatives still honour those who fought in the Great War

We will remember them

Relatives still honour those who fought in the Great War
Star Wars Episode VII is being shot on film - and now Kodak is launching a last-ditch bid to keep celluloid alive

Kodak's last-ditch bid to keep celluloid alive

Director J J Abrams and a few digital refuseniks shoot movies on film. Simon Usborne wonders what the fuss is about
Once stilted and melodramatic, Hollywood is giving acting in video games a makeover

Acting in video games gets a makeover

David Crookes meets two of the genre's most popular voices