Inside the chilling world of the Mean Girl MURDERERS: Sinister true crime doc is set to lift the lid on vicious female killers - from the high schooler who stabbed her lesbian lover's mom to death to a homecoming queen's deadly love rivalry

Teenage girls can be a handful at the best of times, but a sinister new true crime series is set to delve into the most horrifying side of female rivalries - laying bare the most heinous murders committed by young women.  

Investigation Discovery has given DailyMail.com an exclusive look at the trailer for its new series of Mean Girl Murders - which offers insight into the sinister minds of viscous young female killers.

The second season of Mean Girl Murders is set to explore several twisted cases of rage and rivalry, lifting the lid on the very dark side of female connections.

According to the network, the series will cover a number of shocking cases, including a love rivalry between a 'dairy princess and a homecoming queen' whose fight over a handsome farmer 'turns deadly'.  

Investigation Discovery has released the trailer for their new series of Mean Girl Murders - a look into the sinister minds of viscous young female killers

The second season of Mean Girl Murders is set to explore even more twisted cases of rage 

The documentary series will also cast light on a 'fierce feud between two top students for the title of valedictorian that results in a shocking act of violence in the middle of Economics class', as well as a complicated case of how 'one woman’s lie around her own pregnancy motivates a twisted kidnapping case with a horrifying conclusion'. 

'From cutthroat competition to pangs of jealousy and cruel gossip, each episode will dig deeper into what pushed these mean girls to murder,' the synopsis reads.

Episode one In Deadly Harmony centers around the gruesome 2012 murder of a mom from Humble, Texas, who was found stabbed to death in bed in her family home and the sexual relationship which was uncovered between the victim's daughter Keri, and her mom's killer.

Mary Ann Murphy, 48, was attacked in her home at around 1 a.m. on July 15, with her attacker breaking in and stabbing her over 70 times.

Murphy's 16-year-old daughter, Keri, initially told neighbors and police two men had broken in and attacked her mom before fleeing the scene. 

However, by the time help arrived her mother had died from her wounds. 

'[Mary Ann was stabbed] on her legs, on her arms, hands, neck, in the face,' Craig Clopton, a former investigator at the Harris County Sheriff’s Office, in an episode of Killer Couples in 2018.  'It was obvious that it was a very brutal attack.'

'She said her mom was screaming loud, and I did think I heard a scream but I didn't know for sure,' their neighbor Marcus Cox said at the time, the morning after the murder. 'I just thought it was some kids down the street.'

It was just days before detectives realized Kerri's story was fabricated, with investigators becoming suspicious after noticing the blood has coagulated- indicating Keri may have waited longer to call the police than she said.

The all-new season diving into more real-life mysteries that explore the dark side of female connections and rivalry

Episode one In Deadly Harmony centers around the gruesome 2012 murder of a mom from Humble, Texas who was found stabbed to death in her home

Accused: Rebecca Renee Keller (left), 20, and Zein Imran Ahmed (right), 21, were charged with the murder of Mary Ann Murphy in Texas - however the murder charges again Ahmed where dropped after it was discovered Keller and Keri conspired and committed the murder 

Keri's story began to change and after taking a polygraph test, the teen confessed she knew who killed her mother - her friend Zein Ahmed, 20,

Police arrested the pair after finding the knife used in the brutal stabbing was found at his home just blocks away - however, they soon suspected a third person.

Their investigation into phone calls and text messages between Kerri and Ahmed led them to Rebecca Keller - who was also Kerri's older lover.

Kerri was a social high schooler and eager choir member until she met then 19-year-old Keller- with friends and family saying then teen was 'infatuated' with the older girl.

'They clicked immediately. It was an immediate draw towards each other,' Keri’s brother Scott recalled on an 2018 episode of Killer Couples.

'I had never seen Keri become completely and utterly infatuated with a single person.' he added. 

Other episodes this season on Mean Girl Murders will feature a rivalry between a Dairy Princess and Homecoming Queen over a handsome farmer and a fierce feud between two top students for the title of valedictorian that results in a shocking act of violence in the middle of Economics class

 From cutthroat competition to pangs of jealousy and cruel gossip, each episode will dig deeper into what pushed these mean girls to murder

Keri confessed she enlisted Ahmed's help to murder her mom and she didn't approve of the age difference between her daughter and Keller, but it wasn't long until they realized something wasn't right.

Investigators looked into phone records for burner phone found in the family home and finding she had managed to continue talking to Keller after her mom had banned her using the phone, and they had been in constant communication the night of the murder.

'Keri was googling ‘what's the quickest way to kill somebody?’ Clopton said. 'Those Google searches were at the same time she's talking on the phone with Rebecca. So I know that they are scheming this together.'

Keller, 20, was arrested and charged with murder - as well as sexual assault of a child, as she was in a sexual relationship with 16-year-old Kerri at the time. 

Both girls were arrested and recorded phone calls before they went to trial found that Keller stabbed Murphy, not her daughter. However, she was the mastermind behind the plan.

Both Keller and Keri took plea deals, with Keller sentenced to 60 years and Keri 30. The murder charges again Ahmed where dropped.

New episodes of Mean Girl Murders premieres Monday, March 25 at 9/8c on ID.