Bobby Brown's sister Leolah Brown isn't holding back anymore when it comes to her feelings about Bobbi Kristina Brown's longtime boyfriend Nick Gordon.

Leolah posted an open letter to Dr. Phil on Facebook March 7 -- just days after Gordon participated in a sit-down interview with the psychiatric expert before allegedly entering rehab -- to share her family's contempt for Gordon, Us Weekly reported.

"Dr. Phil, With all due respect, Nick Gordon is under investigation for the attempted murder of my niece Bobby Kristina Brown," Leolah wrote in the post.

"We have strong evidence of foul play. Until this investigation is completed by law enforcement, I would ask that you or anyone else not provide this individual a platform to spin this situation to his benefit."

Bobbi Kristina was found face down and unresponsive in her Georgia home's bathtub on January 31 by her friend Max Lomas.

Gordon, who was home at the time and has a history of domestic violence, then attempted to revive Bobbi Kristina before she was rushed to the hospital and put on life support. Injuries found on her body prompted a criminal investigation with Gordon as the main suspect.

"If Nick Gordon does not have the courage to speak with my brother Bobby Brown and/or law enforcement about what happened the day my niece's body was found in a bathtub, he does not deserve to have a platform to speak to anyone of your caliber until this investigation is concluded," Leolah continued on Facebook. "Respectfully, Leolah Brown."

Gordon reportedly checked into rehab on Friday, March 6 for drug abuse, depression and suicidal thoughts after appearing on Dr. Phil in an episode that will air Wednesday, March 11.

In the last few weeks, Gordon and Bobby have feuded publicly about visitation rights. Gordon has claimed he's desperate to see Bobbi Kristina in the hospital, while Bobby's lawyers have said Gordon has refused to cooperate with the Brown family's requests and only then was denied the opportunity to see her.

Bobbi Kristina currently remains on life support at Emory University Hospital in Atlanta, GA. She was just recently taken out of a coma and given a tracheotomy.