COEUR d’ALENE — A teen who accepted a plea deal for his role in a drug deal gone bad has been placed on a rider with a lengthy underlying sentence.

Vadin K. Bartlett, 18, of Coeur d’Alene, pleaded guilty in accordance with Alford in October to attempted robbery, a felony punishable by up to 15 years in prison.

By entering an Alford plea, Bartlett did not admit guilt but acknowledged there is enough evidence to convict him at trial.

First District Judge Lansing Haynes sentenced Bartlett on Wednesday to 12 years in prison, with five years fixed and seven years indeterminate.

Haynes opted to retain jurisdiction in the case.

That means Bartlett will spend about six months in a prison treatment program, called a rider, before Haynes either places him on probation or sends him back to prison.

The charge stems from the fatal shooting of 20-year-old Gabriel R. Casper.

Police responded May 31 to the area of 23rd Street and Coeur d’Alene Avenue, where a motorcyclist had discovered a man, later identified as Casper, on the road in a pool of blood.

Neighbors attempted to render aid before first responders arrived but couldn’t find a pulse.

Casper was later pronounced dead at Kootenai Health.

Witnesses said they saw a red Jeep speeding away from the scene after gunshots rang out.

Bartlett identified himself to police as a friend of Casper’s, along with a 17-year-old boy and a 17-year-old girl.

The three teens reportedly told police that Casper had planned to steal drugs from a Spokane dealer, 19-year-old Matthew J. Holmberg.

Prosecutors said Casper arranged to meet Holmberg and 23-year-old Liberty Lake resident Dennen T.G. Fitterer-Usher in Coeur d’Alene to purchase illegal pills laced with fentanyl, a synthetic opioid more powerful than morphine.

Bartlett and the other teen boy agreed to help Casper steal the drugs, while the teen girl agreed to be the getaway driver, police said.

Bartlett and Casper were reportedly both armed with handguns when they got into the back of Holmberg’s vehicle, a red Jeep Wrangler.

Casper and Holmberg struggled over a duffle bag containing drugs, police said.

Fitterer-Usher, who was in the front passenger seat, allegedly pulled out a handgun and fired at the people in the back.

Bartlett and the other teen told police they scrambled to get out of the Jeep and bolted.

Casper sustained gunshot wounds in his head, chest, arm and hand, according to court documents.

His body reportedly fell out of the Jeep as Holmberg fled the scene.

The day after the shooting, Fitterer-Usher contacted law enforcement and said he killed Casper in self defense.

When interviewed by police, Fitterer-Usher said Holmberg asked him to accompany him to a drug deal in Coeur d’Alene on May 31.

He said Casper and another person got into the back of Holmberg’s Jeep and almost immediately pulled out handguns.

Fitterer-Usher said he drew his own gun and fired, shooting Casper in the head.

After that, Fitterer-Usher said, he and Holmberg drove to Smelterville to change their bloody clothes. They also attempted to clean the blood from the interior of the Jeep.

Holmberg and Fitterer-Usher are facing federal criminal charges in connection with the shooting.

A grand jury indicted both men in late July on charges of conspiracy to distribute controlled substances, as well as possession and discharge of a firearm in furtherance of a drug trafficking crime.

Bartlett and the other teens were taken into custody June 14, after police obtained warrants for their arrests.

As part of a plea deal, prosecutors dropped felony charges of conspiracy to commit robbery and burglary originally filed against Bartlett.