The investigation into Walls and May began as a result of a traffic stop on October 17, 2004, in Preble County, Ohio. Deputies with the Preble County Sheriff’s Office stopped a white pickup truck and found more than 400 pounds of marijuana. The driver of the vehicle, Paul Burnes of Mesa, Arizona, agreed to cooperate with authorities and go through with the delivery of the marijuana to the Ohio buyers who were waiting with the source of supply at a truck stop at the Jeffersonville mall exit at I-71 and State Route 35. Members of the Fayette County Sheriff’s Office, Preble County Sheriff’s Office, BCI and FBI set up surveillance of the area. They saw the driver of the pickup truck meet with two other vehicles, a white van driven by May and a maroon pickup truck, driven by Walls. Burnes was charged with possession with intent to distribute over 100 kilograms of marijuana and was sentenced to 48 months in prison
The three vehicles left the mall in a caravan, with the pickup truck containing the marijuana in the middle. The vehicles were followed in this caravan for approximately 10 miles through Fayette County, until law enforcement authorities pulled them over. In the van with May was Raymundo Carranza from Arizona. In the pickup truck with Walls was Jose Guadalupe Canez from Mexico.
Following that stop, the four were released from state custody and the case was referred for federal prosecution as part of the Chilly Loco investigation. Over the past five years, investigators developed additional evidence to establish Walls had been trafficking in marijuana in this area since at least 1997. Walls developed sources in both Arizona and San Diego, California and arranged for the shipment of marijuana to him for distribution in Pike County and the surrounding area.
Investigating agents subsequently learned that the 400 pounds seized on October 17, 2004 was to be delivered to Walls. Canez was the supplier from Mexico. Canez had recruited Carranza to travel with him to Ohio to assist in the delivery of the marijuana to Walls. May was recruited by his brother to help with unloading the shipment. The four were on their way to property owned by Walls’ family to offload the shipment when law enforcement agents stopped them.