It's been four years since Michael Arvallo was shot and killed along Interstate 10 while on his way home from a charity event and police have not been able to identify a suspect.
Arvallo's family and authorities hope someone who knows something will come forward with information related to the case. For now, the investigation remains open, but cold.
Silent Witness is offering up to a $1,000 reward for information leading to the arrest and conviction of the person or persons res
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