DJ Khaled's fiancée Nicole Tuck lost her brother in a drug deal gone wrong.

Cops tell TMZ Jonathan Tuck went to an apartment not far from his Bronx home to buy weed. An argument ensued, and the 25-year old Jonathan was shot in the face and killed.

"He's a good guy,” said pal Brandon Davis, 30, who's known Tuck for seven years. “He was in the wrong place at the wrong time. There was no reason for him to be there.”

A 34-year old man was taken in for questioning but so far hasn't been charged.

The famously positive Khaled has yet to comment on the incident. He has been in Minnesota for the Super Bowl. Nicole reportedly rushed to the Bronx when she heard the news.

Prayers to the entire Khaled and Tuck families.