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In an affidavit filed with the complaint, Andrew Roosa, a special agent with the FBI, said that before Williams’ death, the young rapper recorded a diss song that Roosa believed was about Henley.

It’s unclear whether Henley had heard the diss lyrics prior to the killing, according to the complaint.

Lamar's diss track, Not Like Us, a viral hit since last summer, accuses the Canadian star of inappropriate relationships with underage girls - claims Drake denies.

Not Like Us, the diss track that became the knockout blow in his feud with fellow rapper Drake, was streamed 6.4 million times in the UK in the last week.

After years of speculated disses by Drake in songs like “Worst Behavior” and “Nothings Into Somethings,” Williams took the opportunity to perform with his biggest adversary.