Pretty Little Liars: Jas and Tas Whitehead murdered their mother in cold blood.

Jarmecca Yvonne "Nikki" Whitehead

She was a 34-year-old mother of 16-year-old identical twins named Jasmiyah Kaneesha Whitehead and Tasmiyah Janeesha Whitehead.

She was described by her friends as a "loving and open" mother whose rebellious teens increasingly challenged her on issues of dating, cell phone use and even about going to school.

She was found dead in the bathroom of her boyfriend's Conyers, Georgia, home in the Bridle Ridge Walk subdivision on the afternoon of January 13, 2010.

She had been beaten and stabbed 80 times.

Her daughters had been living with their great-grandmother Della Frazier and had been moved back to Conyers with Jarmecca Whitehead just a week earlier.

On June 28, 2008, Nikki called the police.
She said the twins attacked her.
Minutes after officers calmed the situation down.
Later Nikki ran out of the house to their police car, saying the girls attacked her again.

Nikki had scratches and she had red marks she had not had before.

Police arrested the twins, and a Juvenile Court judge ruled them "ungovernable."
He placed them in Frazier's custody and ordered the whole family to counseling.

In 2009, the twins were back in Juvenile Court for truancy and running away from home.
A judge placed them back in Nikki's custody.

After there more incidents ensued.
Nikki called, saying Tasmiyah was throwing food.
The next day, Tasmiyah called saying that a dispute between her and an aunt led to a "pushing match" at a welcome-home party for the twins.

Jan. 13, 2010, Tasmiyah ran from the house and approached a Rockdale County Sheriff's Office deputy who happened to be nearby.
She told the deputy her mother was dead.

Nikki's body was in the bathtub, with multiple stab wounds. 

Many were shallow, but there were deep wounds penetrating both lungs, the jugular vein and the spinal cord. 

She was almost decapitated.

A medical examiner later ruled the wounds were all "survivable" if Nikki had been treated immediately.

The twins, were crying and upset when they told police they came from school and found their mother dead. 

The night before, Nikki argued on the phone with another boyfriend, and was so drunk the twins had to help her into bed, they said. 

That morning, they claimed, they missed the school bus but were unable to get any response from behind their mother's locked bedroom door.

Police noticed that both twins had scratches, cuts and bite marks on their arms and fingers. 

The girls had various explanations for the wounds. 

Tasmiyah claimed that "when she became stressed, she would bite herself."

The medical examiner noted that there was no forced entry and no sign of sexual assault. 

The violence of the killing looked like a "crime of passion...not a stranger-on-stranger case."

Police ruled out Nikki's boyfriends as suspects with evidence ranging from DNA testing to phone and GPS records.

Security video from the Shell gas station on West Avenue, near the crime scene, showed the twins walking on Green Street and getting into a car with an unknown driver around 10:15 a.m., which was long after they told police they had gone to school. 

Video footage and a hall pass from the high school showed they arrived there around the same time.

There was a a two- to three-hour unexplained gap in time in the twins' story.

A forensic dentist examined the bite marks on the twins, comparing them with tooth impressions taken from them and Nikki's body.

The bite on Tasmiyah Whitehead's left arm was placed there by her mother.

DNA matching the identical twins was found in blood on a broken vase and shoes inside the house.

Her daughters were arrested on May 21, 2010 and charged with her murder.

Both pleaded not guilty. 

Later, in a plea agreement, each twin pleaded guilty to the lesser charge of voluntary manslaughter in 2014. 

Tasmiyah told prosecutors she and her sister awoke that day late for school and encountered their mother in the kitchen.

They said that their mother hit Jas with a pot, Tas took the pot from their mother .
Then their mother grabbed a steak knife.

There was name-calling and cursing and gouging and scratching and everybody was mad.
During the fight, her mom was cut and stabbed.

Jarmecca Whitehead left the house seeking help from a next-door neighbor, according to prosecutors.

The twins dragged their mom back inside the home and stabbed her some more.

They then drug her to the bathroom and put her in the tub.

She went under the water a couple of times and then died.

The twins were sentenced to serve 30 years in prison.