By KC Baker
October 11, 2016 06:18 PM

The unarmed Oklahoma man who was fatally shot by a police officer last month had the hallucinogenic drug PCP in his system when he died, according to the Office of the Chief Medical Examiner in Oklahoma City.

Terence Crutcher, 40, had “acute phencyclidine intoxication” when he was shot and killed on Sept. 16 in Tulsa as he approached his SUV with his arms raised, according to an eight-page report from the Office of the Chief Medical Examiner obtained by PEOPLE.

The shooting was caught on tape, with video showing Crutcher, who is black, walking away from police offers after they confronted him in North Tulsa. Footage released from the shooting triggered nationwide protests against police shootings of unarmed black men.

The officer who allegedly shot him, Betty Jo Shelby, was charged with first-degree manslaughter in his death, Tulsa County District Attorney Steve Kunzweiler announced at a September press conference.

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AP Photo/Sue Ogrocki

The district attorney said Shelby “reacted unreasonably by escalating the situation from a confrontation with Mr. Crutcher, who was not responding to verbal commands and was walking away from her with his hands held up, becoming emotionally involved to the point that she overreacted,” according to the Tulsa World.

According to the medical examiner’s report, Crutcher suffered a “penetrating gunshot wound of chest.” Both of Crutcher’s lungs were pierced and four of his ribs were broken, according to the report.

The medical examiner recovered a bullet fragment from Crutcher’s chest.

Tulsa Police Department via AP, File

Shelby has pleaded not guilty to the charges. She faces between four years to life in prison if convicted.

Shelby’s attorney, Scott Wood, could not immediately be reached by PEOPLE for comment. He has said Shelby feared for her life before the shooting, given Crutcher’s alleged behavior.

Crutcher’s twin sister, Tiffany Crutcher, has previously spoken out about his loss.

“The ‘big bad dude’ was my twin brother. That ‘big bad dude’ was a father,” she said, according to the Associated Press.

“That ‘big bad dude’ was a son. That ‘big bad dude’ was enrolled at Tulsa Community College, just wanting to make us proud,” she said. “That ‘big bad dude’ loved God. That ‘big bad dude’ was at church singing with all of his flaws, every week. That ‘big bad dude,’ that’s who he was.”