Stanley Edward Sandage, a 33-year-old truck driver for Whitfield Tank Lines, was found shot to death in his tank truck at a rest area near Flagstaff, Arizona, in January 1974. About $42 was taken from his wallet, and an X had been painted on the truck’s window before the killing.

Investigators traced the crime to two brothers, 25-year-old Randy and 23-year-old James Greenawalt, who were arrested in Tempe after trying to use Sandage’s MasterCharge card to buy stereo equipment. A search of their vehicle turned up a .32-caliber pistol later identified as the murder weapon and a .243-caliber rifle. A third man, 33-year-old George Sanders, was arrested on related federal firearms and credit card charges.

Randy Greenawalt pleaded guilty to avoid the death penalty, received life, and testified against his brother; James, who maintained his innocence, was convicted and also received life at Florence State Prison. The brothers were also linked to the murder of another truck driver, Henry A. Weber, in Mississippi County, Arkansas, days before Sandage’s death.

Did anyone who knew Sandage or his routes notice unusual activity at rest areas around that time?