He said Jackson’s murder was “truly unique,” adding the department had not once worked a decapitation case. FBI Special Agent in Charge Christopher Freeze similarly noted he’d yet to work a case like this during his time in law enforcement.

“I have not seen this in my career, certainly not here in the United states,” he said.

Gang experts this week have confirmed the presence of MS-13 in Mississippi — a group whose violent deeds often involve decapitation and burning of bodies, according to the Ledger.

Johnny Jackson tearfully recalled seeing his younger brother for the last time Friday. He said he believed Jeremy was targeted for a reason.

Man, 20, decapitated by Brooklyn F train

“From my speculation it was a message sent from somebody or to the city because you just don’t kill somebody in the bushes then take their head and put in on display,” he told WLOX. “They displayed him and you could ride down the street and see it on the step. To me, it was a message to somebody.”

Johnny told the news station his brother had been living with him while he worked toward his degree and cared for his three children.

“They might do it to someone else, we need to stop this, we need to stop the violence, all this unnecessary kind of stuff really needs to be solved cause they might do it again,” he said.

Police on Tuesday offered a $20,000 reward for information leading to an arrest or conviction in the case.