DJ Khaled's Fiancee's Murdered Brother Was at Apt. for Super Bowl, Not Drugs

DJ Khaled's fiancee's murdered brother wasn't involved in a drug deal gone bad and was simply caught in the wrong place at the wrong time when he was shot ... so says a source close to the family.

Nicole Tuck's brother Jonathan was killed in a Bronx apartment Sunday during what the NYPD called a botched weed deal. However, sources close to the family tell us Jonathan was only at the apartment to watch the Super Bowl.

Our sources say while Jonathan was there, there was an attempted robbery and, in trying to defend himself, Jonathan was shot in the back of the head -- not in the face -- as was first reported.

Jonathan was a devoted father to his 2-year-old daughter Gianna. We're told he was a stay-at-home dad who always put family first ... he was a loyal son and uncle as well. Jonathan and Nicole were very close.