The San Juan County Sheriff's Office filed murder charges against Gabriel Alcon on Wednesday.
Alcon, 22, was charged with an open count of murder. If convicted of first-degree murder, he would face a minimum of 30 years in prison, Chief Deputy District Attorney Brent Capshaw said.
Jacquez, 32, was killed May 27 and his body was found two miles north of NM 516. He was shot five times in the back of his head and was only wearing boxer shorts and socks when he was found by a cyclist, according to court documents.
Alcon, 22, was one of five people arrested and charged with conspiracy to commit murder and tampering with evidence in the days following the shooting.
Since the arrests, detectives interviewed several people who reported Alcon told them in the days after the shooting that he killed Jacquez, according to court documents.
There are also several witnesses that reported seeing Alcon and Jacquez together before the shooting.
"The police are mistaken," Eric Morrow, Alcon's attorney, said. "The case is built on a foundation of drug addicts and he is an innocent man."
Sheriff's detectives allege Alcon unloaded his revolver into the back of Jacquez's head while he was riding in the front passenger seat of Sarah Martinez's Hyundai Sonata.
Alcon, Martinez and Richard Winters were allegedly in the vehicle when Jacquez was shot.
Martinez, Winters, Richard Montoya and Martin Martinez, Sarah's father, were arrested and charged with tampering with evidence and conspiracy to commit murder.
Police allege after Jacquez was killed, the group of suspects frantically tried to hide the crime.
Sarah Martinez's vehicle was found at her friend's house in Aztec on May 29.
The Hyundai was cut with grinders down to its frame. The doors, hood and truck were cut off and the interior was ripped out.
The Sheriff's Office uncovered parts of the vehicle that were buried and partially burned in a nearby fire pit, along with bloody clothes and other evidence, according to court documents.
Sheriff's detectives also found a gun believed to be used in the homicide buried near County Road 2595.
Alcon is being held at San Juan County Adult Dentention Center without bond.