The Federal Bureau of Investigation and the Scottsdale Police Department are set to release new age-enhanced pictures of Robert William Fisher.
Fisher, one of the FBI's Ten Most Wanted Fugitives, is accused of killing his wife and two young children and setting their Scottsdale home on fire in 2001.
Investigators found Fisher's car and the family dog near Payson, and authorities stressed last year the case remains a focus for Scottsdale police.
Fisher is wanted on three counts of first-degree murder, arson of an occupied structure and unlawful flight to avoid prosecution, according to a release from the FBI.
The release of the age-enhanced photos Friday is timed in conjuction with the 15-year anniversary of the crimes, which happened on April 10.
Stay with ABC15 for any new developments from Friday's event.