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Fulton County Sheriff's Office

The mother of a DeKalb County teenager who threatened the lives of the Fulton County Sheriff and his wife spoke out in defense of her son.

Quartavius Mender, 18, was arrested after he allegedly made several death threats toward Fulton County Sheriff Pat Labat and his wife, Jacki Labat.

According to 11Alive News, the teenager demanded the release of rapper Young Thug, who is being held in the Cobb County Detention Center on felony RICO racketeering charges.

"#freethug or Imma sh00t u and your wife," Mender wrote, according to arrest warrants reviewed by The Atlanta Journal-Constitution. He allegedly wrote on the sheriff's Instagram page, saying, "Imma assassinate you."

Erika Goldring/WireImage

Young Thug (pictured) and rapper Gunna are among 28 people charged in a sweeping 88-page indictment last month.

Mender is charged with 23 counts of making terroristic threats toward the sheriff and his wife in several social media posts in May.

"We've known about these threats for a week or so," Sheriff Labat told Shelley Wynter, co-host of WSB Radio's "Word On the Street," on Friday.

"These were public social media threats. I call it cyberbullying. It was on our social media - both mine, my wife's, as well as the public Fulton County Sheriff's Office social media. Mostly on Instagram."

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Labat added: "I signed up for this. But, you cross the line when you start talking about my family, my wife... How smart can you be to threaten the sheriff? You know how I am about my wife. We're not taking anything for granted."

Mender's mother, Malaika Kulenga, and his sister, Deniecia Kelly, told 11Alive that Mender has a history of bipolar disorder, for which he is being treated. They said he is not connected to any gang.

11Alive also spoke with Mender on the phone from the jail. He said that even though his cousin, who shares the same last name, is among the alleged gang members indicted along with Young Thug, he has never been close to that cousin.

Mender insists he didn't make any death threats on Instagram.

11Alive asked Mender why he thinks investigators traced the death threats to him.

"I really don't know. It wasn't me," Mender said. "I'm not a part of no gang, I'm not a part of YSL, I'm not part of nothing."

Mender's mother and sister think investigators are charging anyone they think can testify against Young Thug or Gunna, the alleged ring leaders of Young Slime Life street gang.

"Young Thug don't know him," Deniecia Kelly said of her brother. "He don't know Young Thug. He don't know nobody. They can't trace a phone call or a message or nothing with anybody affiliated with YSL."

"My son is really a person that really needs help," Mender's mother, Malaika Kulenga, said. "Right now, what they're doing is trying to put him in this situation, but he has nothing to do with it. He can't tell them anything because there's nothing to tell. There's nothing. So he's not a part of any gang, he's not a gang member."

Mender is being held without bail in the Fulton County Jail.

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Fulton County Sheriff's Office

The Fulton County Sheriff's Office charged Quartavius Mender, 18, with making death threats against Fulton County Sheriff Patrick "Pat" Labat and his wife, Jacki Labat.

Mender is charged with 23 felony counts for making terroristic threats, Channel 2 Action News reports.

The teen is accused of threatening to kill the Labats if a certain high-ranking member of the Young Slim Life (YSL) record label and street gang wasn't released from the Fulton County Jail.

The death threats were made in social media posts, according to sources.

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"We take these kinds of brazen threats seriously," Sheriff Pat Labat told reporters. "Social media cyberbullying, and hiding behind a keyboard will not protect someone from criminal prosecution. Our investigators are diligent in seeking individuals who mean to do harm to anybody, and I am grateful to them for ensuring the safety of myself, my wife, and all citizens of Fulton County."

Rappers Young Thug and Gunna are among 28 people charged with violating Georgia's RICO laws in a sweeping 88-page indictment last month.

Gunna, who turned himself in on May 11, is housed at the Fulton County Jail, while Young Thug was transferred to the notorious Cobb County Detention Center near Atlanta on May 13.

According to Channel 2 Action News, one of the names listed in the indictment is Tenquarius Mender, who is housed at the Fulton County Jail. Channel 2 is working to confirm if Quartavius Mender and Tenquarius Mender are related.

Fulton County District Attorney Fani Willis has accused YSL gang members of committing over 50 murders and gun violence across Atlanta since 2012.

Young Thug, born Jeffery Williams, was again denied bond during an hours-long hearing before a Superior Court judge in Atlanta on Thursday, June 2.

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The rapper watched the hearing remotely from a small room at the Cobb County Detention Center for nearly 10 hours.

The judge denied bond even though Young Thug's attorneys promised to hire a team of off-duty law enforcement officers to guard him 24 hours a day during home confinement.

Attorney Brian Steel said his client offered to be on house arrest at any one of his four Atlanta-area homes before trial, according to The Atlanta Journal-Constitution.

Paras Griffin/Getty Images

Young Thug's record label/gang, YSL, is blamed for over 50 murders in the Atlanta area, according to the District Attorney.

Thug, real name Jeffery Williams, and rapper Gunna, born Sergio Kitchens, are among 28 people charged in sweeping RICO violation indictments.

Prince Williams/Wireimage

DA Fani Willis said Young Thug (pictured left with Gunna) is the leader of a violent street gang that committed more than 50 murders and gun violence around Atlanta.

Willis told Channel 2 Action News that the gang committed 50 murders and multiple incidents of gun violence dating back to 2013.

Donovan Thomas was named in the 56-count indictment as a murder victim. Thomas was killed outside a barber shop in Atlanta in 2015. Thug is accused of renting a 2014 Infiniti Q50 sedan from Hertz that was used in the murder.

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"[Thomas' murder is] extremely significant," Willis told WSB-TV. "It occurred back in 2015. And what myself and any law enforcement member can tell you as a result of that the back-and-forth gun violence and murders that have occurred have probably been in excess of 50 since 2015—triggered by that in the back-and-forth between that [YSL] gang and other gangs."

However, Thug's attorney, Brian Steel tells XXL magazine that his client is innocent.

"Mr. Williams has committed no violation of law whatsoever. We will fight this case ethically, legally, and zealously. Mr. Williams will be cleared."

Thug was arrested on May 9 during a raid on his $2.2 million Buckhead mansion. Additional charges were added after investigators found illegal firearms including an assault rifle in the house.

He was transferred from Fulton County to the Cobb County Jail on May 13. He is being held without bond.