“Foul play is begin investigated,” a family source tells PEOPLE. “Including drug use and possibly cover up to remove evidence from the crime scene.”
At the center of that investigation is Bobbi Kristina’s boyfriend Nick Gordon, a source with knowledge of the case told CNN. Another source close to the family told the news network that the 21-year-old daughter of Whitney Houston had “injuries that still need to be explained.”
In addition, law enforcement insiders told TMZ that police are looking into a possible altercation between Bobbi Kristina and Gordon more than an hour before she was found unresponsive. Multiple sources told the site that there is a history of violence between the two.
According to TMZ, Max Lomas, the friend who discovered Brown’s body with Gordon, claims that he saw Gordon cleaning blood stains.
Roswell Police Chief Rusty Grant told PEOPLE that the police are “going to follow the evidence and see where it leads us.”
Family members gathered at Bobbi Kristina’s bedside throughout the past week to offer their support.
In an emotional Facebook post on Thursday, her cousin Jerod Brown asked fans to pray for a miracle.
“Though it seems the odds are against her, though doctors don’t see any hope for change, though we might want to play detective and find out how she got there, though it looks impossible for her to stand again STILL PRAY FOR BK,” he wrote.
Lawyers for Bobby Brown and Max Lomas did not immediately respond for comment.
For more on Bobbi Kristina, pick up the new issue of PEOPLE, on newsstands now
•Reporting by LIZ MCNEIL
More on Bobbi Kristina Brown:
• Bobbi Kristina’s Cousin: We’re Still Praying, ‘Though Doctors Don’t See Any Hope for Change’
• Family Gathering to Say Goodbye to Bobbi Kristina Brown
• Max Lomas, Who Initially Found Bobbi Kristina Brown Unresponsive, Just ‘Wants His Good Friend Back’
• Houston Family Had Restraining Order Against Bobbi Kristina’s ‘Husband’ Nick Gordon
• Bobbi Kristina and ‘Husband’ Nick Gordon Were Never Married
• Bobby Brown’s Bedside Song to Daughter Bobbi Kristina: ‘The Greatest Love of All’
• Were Drugs Involved with Bobbi Kristina Brown’s Near-Drowning?
• Kevin Costner on Bobbi Kristina Brown: ‘I Can’t Imagine’ What Her Family Is Going Through
• Bobbi Kristina Brown’s Family Keeping Hospital Bedside Vigil
• Bobbi Kristina Brown Is ‘Fighting For Her Life,’ Family Says
• For Bobbi Kristina Brown, Minutes Without Air ‘Could Be Grim’
• Bobbi Kristina Brown Is Still Unresponsive, According to Source
• Do Bobbi Kristina Browns’s Social Media Accounts Hold Clues About Why She Was Found Unresponsive?
• Bobbi Kristina Brown: Inside the Troubled Life of Whitney Houston’s Daughter
• Bobbi Kristina Brown Hospitalized After Being Found Unresponsive in Tub
• Stars Rally Around Bobbi Kristina Brown
• Bobbi Kristina’s Husband Is Not the Bad Guy, Says Source
• Bobby Brown ‘Inconsolable’ Over Bobbi Kristina’s Hospitalization
• Bobbi Kristina Brown Recovery Would Be a Miracle, Says Source