The defense rested its case in the Delvecchio Patrick murder trial Thursday afternoon after alleging Deanna Cook had been hallucinating, leading her to think she was being attacked.
Forensic psychologist Dr. Kristi Compton testified that Cook was bipolar, suffered from schizophrenia and mood disorders and abused PCP and marijuana.
Dr. Compton said that such disorders can lead to hallucinations, delusions and a skewed perception of reality.
Cook was killed nearly two and a half years ago. Her ex-husband, Patrick, is on trial for her murder.
On Thursday, the defense focused on Cook's history of PCP abuse.
Dr. Compton testified that a person on PCP can hallucinate and think they were attacked.
Under cross examination, however, Compton said she saw nothing indicating Cook was delusional or hallucinating during her 911 call.
Forensic toxicologist Gary Wimbish testified that Cook had a PCP concentration at a level where fatalities have been seen.
Yet earlier this week, a medical examiner ruled Cook's death by homicidal violence including drowning.
Patrick did not testify on his own behalf.
Prosecutors called on a rebuttal witness, Jamie Hardiway, who is a former Dallas County jail employee.
Hardiway testified that she heard Patrick tell another inmate that he killed Cook.
The inmate, Clint Stoker, denied ever hearing Patrick's confession.
Closing statements and deliberation are likely to take place Friday morning.