R&B singer D4vd used chainsaws he bought from Amazon to cut up the body of the teenage girl he murdered and left to rot in the trunk of his Tesla, prosecution documents claimed on Wednesday.

The internet breakout star killed Celeste Rivas Hernandez because she threatened to reveal their long-standing and illegal sexual relationship, which began when she was just 13, charging papers allege.

He then hacked up her corpse, using a plastic paddling pool to contain the blood, and stuffed it into bags that he left in his car on the streets of the swanky Hollywood Hills neighbourhood, before leaving for his music tour around the United States, prosecutors said.

The 21-year-old, whose real name is David Burke, could face a life sentence or the death penalty if convicted of the child’s murder. He denies the charge.

A short court appearance in Los Angeles on Wednesday revealed the first full accounting of what detectives believe happened to Celeste, who had been reported missing from her home east of Los Angeles.

Los Angeles County Deputy District Attorney Beth Silverman filed a brief outlining the evidence she intends to present at any eventual trial.