If it is, Raul Avalos likely will be charged with murder, Chief Deputy District Attorney Dustin O'Brien said.
Demetrius Garrett, of Aztec, died Nov. 3 at a hospital in Denver, two days after he turned 20 years old.
Garrett was shot in the leg and chest earlier this year at the end of a St. Patrick's Day Party at a home at 603 Taos Ave.
He was taken to the hospital and survived the shooting but never fully regained his health, according to court documents.
Avalos, 26, was arrested and charged with attempted murder in the second degree and 16 other felonies relating to the shooting.
He was scheduled to go to trial to face the attempted murder in January.
Police said Avalos shot Garrett while he was sitting on a couch at a party, according to court documents.
The shooting happened in front of numerous people, including a 13-year-old girl and Garrett's sister, who was shot in the leg.
Police have at least seven witnesses who reported they saw Avalos shoot Garrett, according to court documents.
A document filed in court on Sept. 12 said Garrett had to be readmitted to the hospital because of heart problems.
The document also said he was suffering from psychological trauma.
Prosecutors have requested Garrett's medical records to determine if his death was because
"If we have evidence that the cause of death is a result of the defendant's action, then charges will be amended to homicide," O'Brien said.
Sheriff's office detectives have been monitoring Garrett's health since the incident and are also working with doctors to evaluate whether the shooting caused his death, San Juan County Sheriff's Office Lt. Cory Tanner said.
"He has had ongoing medical conditions as a direct result of the shooting," Tanner said.