Jackson also shared a post from L.A. rap legend Snoop Dogg, which reads ... "you gotta be careful being happy around unhappy people".
2-time NBA champ and North Carolina AT&T golfer,J.R. Smith, also shared condolences on social media, saying ... "Sh** is ass man 😞🤲🏽. PnB Rock rest up bro!"
35-year-old Lou Williams -- 3-time NBA Sixth Man of the Year -- shared a photo with PnB Rock, with the caption "Rest Well Rock 💔"
Boxing star Chris Eubank Jr. went to Twitter to express sadness and anger ... saying, "Its so crazy how we’re living in a society where its normal for young black artists to die every year all year round."
"This doesn’t happen in any other culture!! White, Asian, Indian, Latin… no other culture has established artists getting killed like this!! WHY US?? RIP PnB Rock."
PnB Rock was only 30 years old and is survived by his two daughters.