Update

1/14 2:57 PM PT -- Memphis police have a lead in the Big Jook shooting ... posting photos of a white Ford Explorer they say may have carried the rapper's killers.

They're asking the public for help identifying the car and are offering a $4,000 reward for information.

Yo Gotti's brother, Anthony 'Big Jook' Mims, was shot and killed this weekend ... TMZ has confirmed.

Sources with direct knowledge tell us the rapper's older sibling was gunned down Saturday in Memphis on near Winchester Road. Per reports, this murder took place after he'd attended a funeral service in the area.

There are photos and videos circulating online that purportedly show Jook bleeding on the ground with people attending to him. The exact details of the shooting are unclear at this point ... but Jook is confirmed dead.

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