Bobbi Kristina Brown death probe update: Nick Gordon injected Krissi with toxic mixture, documents say - The new documents in a civil lawsuit allege that Bobbi Kristina Brown died after Nick Gordon injected her with a "toxic mixture" and then placed her unconscious in a bathtub.

The allegations which are set to spell more trouble for Gordon are made in response to motion filed by Gordon to stay discovery proceedings in the civil lawsuit filed by Brown's conservator. Discovery is the legal procedures used to gather evidence for a lawsuit.

The 22-year-old Bobby, the only daughter of the late Whitney Houston and Bobby Brown, died on July 26 - around six months after being found unresponsive in the tub of her Roswell, Ga., home. Bobbi never regained consciousness.

The suit was originally filed in June and amended in August after Brown's death. It accused Gordon of assault, battery, intentional infliction of emotional distress, and transferring money from her account into his own without authorization.

For his part, Gordon has denied all allegations. The response to Gordon's motion provide details of the alleged abuse Brown suffered before the incident that led to her death. According to the documents, Brown "died following a particularly violent altercation with (Gordon) that left her battered and bruised, with a tooth knocked out."

Lawyers for Brown's conservator say that Gordon had "no problem giving an interview to Dr. Phil, but asks this court to relieve him of his legal responsibility to participate in discovery in this case." The response goes on to state Gordon has waged "a public relations war with" Brown's family.

It adds that Gordon reportedly received $40,000 to allow a magazine to photograph him at Brown's grave.

According to the response, lawyers say Gordon is arguing that continuing discovery, "his Fifth Amendment rights 'are being implicated,' " and "seeks a blanket prohibition against Plaintiff asking him any questions in discovery."