Documents related to the Monday shooting death of a Madison teenager suggest the alleged killer pulled the trigger “so everyone would know he was a gangster.”

Trevor Davis Cantrell, 29, of 7900 Old Madison Pike, Madison, and Dacedric Deshun Ward, 22, of 122 Sweet Hollow Way, Madison, planned to rob 18-year-old Jason Ender West when they met him Monday afternoon at the Sonic Drive-Thru on County Line Road in Madison-annexed Limestone County, according to a police narrative released Wednesday.

The two had agreed to meet West at the restaurant under the pretense of selling the teen 89 Xanax pills for $300.

Security video shows West get out of the passenger seat of a gray Volvo around 2:41 p.m., next to a picnic table near a Dumpster. He then walked across a field behind the restaurant toward the subdivision where his house is located, investigator Michael Enfinger wrote in a report.

At 3:05 p.m., a beige Nissan Maxima arrived at Sonic and backed into the same parking space. Five minutes later, West came back and walked up to the Nissan and began speaking to the occupants through the driver’s-side window.

After a few minutes, West was shot, jerking forward and clutching his chest before falling against the picnic table and finally collapsing on the ground, Enfinger wrote. West was later pronounced dead at Huntsville Hospital.

Investigators used West’s phone to locate the last number he called and found a listing for 2:45 p.m. Officers confirmed the number belonged to Cantrell and later tracked him down to a Huntsville Wal-Mart, where he was taken into custody.

Through questioning, a witness said Ward had been driving the Nissan Maxima seen in the security video earlier that day and had placed a box of bullets in the vehicle’s glovebox several days ago. Investigators developed Ward as a suspect and arrested him at a Wendy’s on Madison Boulevard, where he supposedly worked.

A search of the vehicle revealed a spent shell casing that matched the type of ammunition stored in the car and used in the pistol confiscated from Ward’s residence, the investigator said. A bullet was recovered from West’s body, but officials have not said if it matches the empty shell casing.

Cantrell later told police he and Ward had planned to rob West, but he didn’t know Ward was going to pull a gun. Cantrell said he set up the meeting and that Ward drove the Nissan to the Sonic. After they received the money from West, Cantrell said Ward brought out the pistol and shot West in the chest.

Ward told investigators that Cantrell had the pistol, but he grabbed it and shot West. Ward would not give a motive, Enfinger wrote, but Cantrell said Ward told him that “he shot West so everyone would know he was a gangster,” the report reads.

Cantrell also showed investigators $24 in cash, which he claims was his cut from the robbery.

Both Cantrell and Ward are facing one charge of first-degree robbery and capital murder. They were booked Monday into Limestone County Jail, where they remained Wednesday with no bond set.