Friends of Wicks and his wife, Sonja, who also works as a manager at the Shell station, were struggling to understand why he was targeted. All described Wicks as a nice guy who always had a smile on his face.
"I can't imagine somebody, knowing Dave, why would anybody do this?" co-worker Kris Cantrell told the Record Searchlight through tears.
Mike Gulizia, a truck driver who had not been in the area in six months, stopped by the store the morning after the incident specifically to tell him hello. He was shocked to learn his friend had been killed.
"I could've stopped by three or four other places, but I knew the manager. I knew him," Gulizia told the paper.
Shasta County Sheriff's Office officials said Wednesday that the Department of Justice is reviewing the evidence in the case, the Record Searchlight reported. California state arson investigators are also assisting in the investigation.
Secret Witness of Shasta County is offering $15,000 for information leading to the arrest and conviction of the person who killed Wicks. A friend has also set up a GoFundMe page to help Wicks' family.
As of Thursday morning, more than $24,000 of the page’s $60,000 goal had been raised.