Chavez-Reyes testified in February at Roberto Miramontes Roman's federal trial on a charge of killing Fox, who was hit by two bullets on Jan. 5, 2010, as she approached a Cadillac she had pulled over near Delta because the occupant was suspected of being involved in a drug transaction.
Chavez-Reyes testified he had loaned the Cadillac to Roman and picked up his friend the night of the shooting after the vehicle got stuck in a snowbank near Nephi. He said Roman told him, "I just shot a cop."
As recently as January, Chavez-Reyes had told authorities he was unaware Roman was wanted in the fatal shooting until they had driven to Salt Lake City. Under cross-examination in February, Chavez-Reyes denied he changed his testimony to try to get an earlier release from prison.
He also testified federal prosecutors were writing a letter to the parole board on his behalf.
The federal trial was Roman's second. He was acquitted in 2012 by a 4th District Court jury of murder, but found guilty of tampering with evidence and possessing a firearm and sentenced to 10 years in the Utah State Prison.
In 2013, a federal grand jury indicted Roman on 11 charges, including intentionally killing a law enforcement officer and using a firearm during a crime of violence. A U.S. District judge ruled the charges do not amount to double jeopardy because the state and the federal government are separate sovereign entities.
This time, Roman was convicted and he is scheduled to be sentenced next month.
In a separate 4th District Court trial, a jury convicted Chavez-Reyes in 2010 of obstructing justice, burglary and tampering with evidence. He was sentenced to 1 to 15 years in prison for obstructing justice and up to five years each for the other counts.
Chavez-Reyes was denied parole in 2011 and had another hearing on Feb. 9, about a week after he testified at Roman's trial.