Lil Durk is upset with D. Rose’s recent 40-year prison sentence.

Durk took to Twitter to react to the sentence, writing, “They slamming all the young bulls free em.”

They slamming all the young bulls free em

— LILDURK2x (@lildurk) February 8, 2017

Ahbir Sardin, aka D. Rose, was charged with killing 14-year-old Venzel Richardson in South Side Chicago, the Chicago Tribune reports.

D. Rose, who faced a maximum of 45 years to life in prison, was found guilty of first-degree murder in September.

Rose, now 20, was reportedly given credit for 1,019 days already served in jail.

Venzel, a freshman at Dunbar Vocational Career Academy, was shot multiple times upon leaving a corner store with friends on the night of Feb. 12, 2014. He was reportedly shot in the upper back, left lower buttock and outer hip. A fourth bullet went though Venzel’s neck and exited through his forehead, according to the Chicago Sun-Times.

Rose, who was arrested April 2014, is accused of firing those fatal shots from a white minivan.

Chief Keef name-dropped Rose in “Love Sosa,” rapping, “Don’t make me call D. Rose boy/He six double-0 boy/And he keep that pole boy/You gon’ get f*cked over.”

D. Rose was also mentioned in one of Keef’s earliest works “John Madden” where Sosa raps, “600 boy, I ride those boys/ D. Rose boy, My lil bro boy.”

Rose can be seen making a cameo appearance in the track’s visual wearing a blue t-shirt and a white skullcap.

Dunbar instructor Greg Ingleright was distraught by Venzel’s death.

“RIP Venzel,” he wrote on Twitter.

Ingleright shared a Chicago News Now story to his Twitter account titled, “Teen, 14, fatally shot in head in Woodlawn on South Side near 61st, Vernon.”

Ingleright was distraught by the violence-plagued areas where his students reside, referring to the city of Chicago as “Chiraq.”

“Teaching in a war zone has got me down #Chiraq,” he wrote.

Venzel’s mother Laveta Richardson was also shaken by her son’s death. Richardson and family say they don’t want the slain teen’s death to be written off as just another dead black kid.

“We don’t want Venzel to be known how the police are portraying him — as a gangbanger,” the boy’s aunt, Denise Richardson, told DNAInfo. “We don’t want him to be another statistic, just lying out there in the snow. Dead. Just another black kid. ‘Oh, he’s in a gang.’”