(TMZ) - Foul play is NOT suspected in the death of Kayo Redd - younger brother of rapper Waka Flocka Flame - law enforcement sources tell TMZ.

Redd died over the weekend ... and so far the cause of death has not been determined ... but sources tell TMZ it does not appear to be a homicide.  TMZ reports there are unconfirmed reports Redd may have taken his own life.

Waka's mother and hip-hop manager Debra Antney confirmed the death on Twitter ... with the message, "I just lost another son." Antney also had a son who died in a car accident when Waka was 13 years old.

Waka tweeted a message yesterday, saying:

Sources tell TMZ an autopsy will be performed today or tomorrow.