UPDATED 1/9, 8:30 a.m. ET: Mother Bernadette Walker, per a report from TMZ on Thursday, says that 19-year-old Michael Sullivan suffers from Schizoaffective disorder. According to comments given to TMZ, Sullivan has recently not been taking prescribed medications. Walker said he had been living with her in the Atlanta area until November of last year, at which point he reportedly stopped his medications. She also pointed to a broken mental health system in the U.S., noting that she couldn't require Sullivan to take the medications once he turned 18. 

UPDATED 1/8, 2:10 p.m. ET: Swae Lee and Slim Jxmmi's half-brother Michael Sullivan was released from the hospital and arrested, TMZ reports. On Tuesday he wa described as "a person of interest" in the killing of Rae Sremmurd's stepfather, Floyd Sullivan.

On Tuesday, Swae tweeted the following:

See original story below.

Rae Sremmurd's stepfather has been fatally shot in Mississippi, and the duo's younger brother is in police custody.

TMZ reports that police were dispatched to the scene on Monday night after a man died from multiple gunshot wounds. The Lee County Medical Examiner said the victim is the brothers' 62-year-old stepfather Floyd Sullivan, while their 19-year-old half-brother Michael Sullivan is being held for psychiatric evaluation and is a person of interest in the shooting.

Floyd Sullivan helped raise both Slim Jxmmi and Swae Lee since they attended middle school, and was living in Tupelo with their mother Bernadette. Police say he is the only victim in the shooting, while Michael Sullivan is currently the only person held in connection with the killing.

The news has arrived just as the duo celebrated the five-year anniversary of their debut album SremmLife. The record came out on Jan. 6, 2015 and helped launch the brothers to fame, anchored by singles like "No Flex Zone" and "No Type." Their most recent release, SR3MM, arrived in May 2018 and saw the duo experiment further with solo material across three discs. They have yet to officially announce a follow-up, but Swae did tease that another album from the two of them would be on the way sometime in 2020. It was recently announced, however, that Swae Lee would perform solo at Coachella.

Complex has reached out to representatives for Rae Sremmurd.