Tekashi 6ix9ine's snitching has put his family in 'grave danger' - Boosie Badazz

Rapper Boosie Badazz is lashing out at Tekashi 6ix9ine for cooperating with prosecutors, saying he'll be "murdered" and his family is in "grave danger" as a result.

Tekashi69, an admitted child sex offender, is facing decades behind bars over charges stemming from a crackdown on the Nine Trey Bloods gang - but may be freed in under a year thanks to a guilty plea deal that incriminates others.

In an Instagram post, Boosie Badazz (formerly Lil Boosie) unleashed on the 'Gummo' hitmaker for being a "rat", renouncing his previous support for him.

"When you first went to jail, I was like, 'free dude', because I don't like to see no one in that cage like that," said the rapper, who has also served time in prison himself.

"But one thing I don't condone or support is rats... I do understand your situation, n***a. I was facing a needle (lethal injection), and [I didn't] bend, break or fold."

Boosie Badazz's admonishing of Tekashi69 for 'snitching' becomes graver toward the end of his post.

"You will be murdered less than a month after your release," the 'Wipe Me Down' hitmaker says.

"[For real, for real] your kids will bullied in school for the decision you made. You put all your family in grave danger for life because of this bullshit, did you think about their safety? ... You don't care about nothin' but you."

Meanwhile, Tekashi69 - real name Daniel Hernandez - has reportedly named his former friend Kintea 'Kooda B' McKenzie as the man who pulled the trigger in a shooting targeting rival rapper Chief Keef.

In addition to Tekashi69's testimony, prosecutors say they have proof showing McKenzie traveling to and from the shooting as well as surveillance footage of him close to the crime scene, amongst other evidence.

Nonetheless, the 21-year-old rapper took to social media last week with a video of himself celebrating being released on US$300,000 bail.

Boosie Badazz's public reprimanding of Tekashi69 follows that of other rappers, including 50 Cent and Meek Mill.