Kevin Daigle “is a damaged person,” John Fabian, a psychologist who specializes in criminal and civil forensic psychological and neuropsychological evaluations, told jurors Tuesday morning on the fourth day of testimony in the penalty phase of Daigle’s first-degree murder conviction.

Daigle was convicted in 2019 of fatally shooting Vincent in the face when the officer tried to help him on the side of the road on Aug. 23, 2015.

Fabian, who said he met with Daigle three times beginning in January of 2017, said Daigle has the dual diagnosis of chemical dependency as well as mental illness. He said medical records document that Daigle has suffered from depression since 1998, and among those records are files for multiple hospital stays for suicidal behavior beginning in 2005.

Daigle “tries to numb his physical and emotional pain,” Fabian testified. “He’s not exaggerating or faking his mental illness.”

Fabian said Daigle has had concussions due to multiple vehicle crashes, was a chronic drinker, suffers from chronic obstructive pulmonary disease (COPD) from years of smoking, has abused multiple drugs and had a mini stroke at some point during his adult life.

“He’s also on his way to dementia. Period. It’s very clear,” Fabian testified.

Fabian said he believes Daigle was impaired during the time of Vincent’s shooting from both drug and alcohol use coupled with his mental illness.

When cross-examined by Calcasieu Parish First Assistant District Attorney Jacob Johnson, Fabian said he would agree that information Daigle gave medical personnel when applying for disability and Social Security benefits in 2005 were “to benefit Daigle” and that Daigle has lied about the type of substances he abused in medical documents.

He said he would also agree with Johnson that if Daigle claims to have been suicidal the day he shot Vincent, it would have been easier for him to kill himself rather than “cock his gun and aim it at a person who was running away from him.”

“He is not a psychopath,” Fabian said. “He has anti-social traits but I do not believe he has an anti-social disorder.”

Dr. Melissa Piasecki, a forensic physiatrist testified she met with Daigle in April of 2019 and has determined Daigle’s substance abuse did impact his mental state.

Piasecki said two hours after Daigle’s arrest, when toxicology tests were performed, his blood alcohol level was at the equivalent of drinking 15-18 alcoholic drinks. At the time of his arrest two hours earlier, it would have been higher, she told jurors.

Alcohol “gets in the way” of judgment and insight, Piasecki said.

She testified Daigle was in active alcoholic intoxication at the time of the shooting while going through detoxification for earlier substance use.

Piasecki said pain medication prescribed to Daigle for arthritis, curved spine and his ankle “only exasperated” his substance abuse disorder.

“He’s trying to make sense of what happened during the shooting without having a full memory of the event,” Piasecki said.

When cross examined by Johnson, Piasecki admitted Daigle was cognizant enough to hide a bright green gun in his lap, blame someone else for driving the vehicle and shoot it at the trooper.

Piasecki said Daigle has memory gaps he tends to fill in holes with information about the attack he has received throughout the years. “Or he could be lying,” Johnson said. “It’s possible,” Piasecki answered.

Dr. Chad Domangue challenged the findings of Fabian, Piasecki and Jeffrey Lewine — a neuroscientist who testified on Monday — when prosecutors called him to the stand as a rebuttal witness.

Domangue said he saw nothing in Daigle’s medical records to prove he has brain damage due to a mini stroke. He said the white mater abnormalities Lewine said Daigle has in his brain would not cause him to become a killer.

“Most of multiple sclerosis patients have white matter abnormalities. Does that make them potential killers? Of course not,” Domangue said.

“If you commit a murder, you have to have the ability to come up with a plan, which is a completely different section of the brain,” Domangue said. “Daigle was able to come up with a plan and knew he needed to take the trooper’s keys to steal his unit and drive away.”

There’s also no evidence in Vincent’s dash board cam footage that shows Daigle suffers blackouts when highly intoxicated, Domangue said.