Chief Keef (NBC Chicago)

NBC Chicago- The stepbrother of teen rapper Chief Keef was shot in the back of the head and killed last week in Chicago, according to local reports.

Ulysses Gissendanner III, 19, was gunned down last Wednesday near 124th Street and South Union Avenue, DNAinfo reports. Gissendanner reportedly had been visiting his uncle in the West Pullman neighborhood when he was shot in a car.

Gissendanner, a rapper called ”YPN Boomtown,” is the stepson of Alfonso Cozart whose son is Chief Keef, aka Keith Cozart. The family said they don’t think Gissendanner’s ties to the rapper spurred the shooting, and Keef’s lawyer told DNAinfo he has no relationship with his father or Gissendanner.

Keef recently released “Finally Rich,” a much-hyped album that sold about 50,000 copies in its first week. He was convicted last year of pointing a gun at a Chicago police officer and came under fire in September for joking on Twitter about the shooting death of an 18-year-old rival rapper, Joseph “Lil JoJo” Coleman. He later claimed his Twitter account was hacked.

Keef moved to Northbrook late last year.

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