The death of Bobbi Kristina Brown remains a troubling mystery. More than three years later, fans of Whitney Houston‘s daughter are still waiting for answers surrounding her mysterious passing. Facts regarding her cause of death remain unclear, leaving some to wonder if then-partner Nick Gordon killed Bobbi Kristina Brown.

On Jan. 31, 2015, Nick found his girlfriend face down in a bathtub in her home in Georgia after a night of partying. He began performing CPR until paramedics arrived at the scene. According to police, Bobbi Kristina was alive and breathing after being transported to the hospital. She was then placed in a medically induced coma after it was declared that her brain function was significantly diminished. Her family later moved her to Emory University Hospital, flew her to Chicago to be seen by specialists, but ultimately, placed her in hospice care after being told nothing more could be done.

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Bobbi Kristina’s burial. (Photo Credit: Getty Images)

Bobbi Kristina passed away on July 26, 2015, at the young age of 22. Her autopsy found no “obvious underlying cause of death and no significant injuries.” However, it did reveal that she had marijuana, alcohol, a cocaine-related substance, anxiety medication, and morphine in her system. Still, no one knows if her manner of death was intentional or accidental.

Her family brought a $36 million civil suit against Nick — he was later held legally accountable for her death after he didn’t show up for a court hearing. “Ms. Brown died due to a violent altercation with [Nick] after which he placed her in a bathtub, unconscious, after he injected her with a toxic mixture,” according to court documents obtained in October 2015 by Radar.

But, Nick has maintained his innocence. And two years after Bobbi Kristina’s death, he spoke out regarding the events that led up to and followed the tragedy. He described his relationship with Bobbi Kristina and Whitney as “cool.” The late singer invited him to move into her home in Georgia when he was 17 and Bobbi Kristina was 14.

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Whitney and Bobbi performing in 2009. (Photo Credit: Getty Images)

“It was like two or three months after I moved in she [Whitney] began to ask me, ‘Call me mom.’ We immediately clicked,” he said. “From day one it was a really, really cool relationship so I’ll miss it forever. It was like a mother, son relationship. It really was.” But, after the “I Will Always Love You” singer’s death Bobbi Kristina became depressed and turned to drugs. According to Nick, her family knew she was struggling but made little effort to help her.

“It was really just us two,” he continued. “Everybody knew [what was going on]. All these family members, all these family members that love and cared for her… everybody knew what was going on and they did nothing. People saw her struggling and nobody did anything.”

He added that he anticipated her family would blame him for her death. “I think in a case like ours you automatically look at the significant other,” he added. “And that’s in every case. But then the fact that it’s Whitney Houston’s daughter amplifies it. You know if there was something concrete I think I’d be in cuffs.”

Even knowing how everything unfolded, Nick doesn’t regret falling in love with Bobbi Kristina. “I’m so happy I got to live with them and give them the little bit of happiness I could towards the end of their journey down here,” he admitted. “I’d do it all over again knowing the outcome.”