There is now a criminal investigation centering on possible foul play in Bobbi Kristina Brown's drowning accident, and sources tell TMZ that the number one target is the starlet's boyfriend, Nick Gordon.

There was reportedly a history of domestic violence between the two, and Bobbi Kristina sustained certain injuries that are a cause for concern. Police believe there may have been a fight before Bobbi Kristina was found face down in the bathtub, and Max Lomas, the friend who found the 21-year-old aspiring singer is pointing the finger at Gordon.

Lomas claims Gordon allegedly cleaned up the home and removed blood stains before cops could get there, and his attorney asked for immunity before he spoke again.

Brown was found lying facedown in the bathtub of their Roswell, Georgia home last Saturday, and though it was Lomas who discovered here there, Gordon was the one who reportedly administered CPR until the police arrived.

Brown was placed under a medically induced coma on Monday, and on Tuesday she was transferred to Emory University Hospital. A rep for the family said in a statement on Tuesday, "Bobbi Kristina is fighting for her life and is surrounded by immediate family. As her father already stated, we are asking you to honor our request for privacy during this difficult time." On Thursday doctors reportedly told Brown's family that there was nothing more they could do for the starlet, and they suggested taking her off life support.