Delia D'Ambra

Her employer provided the supplies for the event, and more than 300 drivers came to have their vehicles washed or to donate money to the cause.

That evening, Brandon's loved ones held his funeral service in the chapel of a local Scottsdale church.

The following Monday, October 27th, Lisa's loved ones laid her to rest at a Catholic cemetery in Mesa.

Around that same time, authorities released the name of a Phoenix man who they wanted to speak with as part of the investigation.

This guy was 34 years old and was described as driving a black Ford F-150 pickup truck with a camper shell and Arizona license plate on the back.

News coverage at the time identified this man by his first and last name.

The sheriff's office emphasized he was considered an investigative lead, but because he was never formally declared a person of interest or suspect in this case, I'm only going to refer to him by his first name, Michael.

There isn't a ton of info in the available source material about him or how he came on authorities' radar, but one could assume a witness provided his name and vehicle information.

However, I don't know that for sure.

According to what a lieutenant for the sheriff's office told reporter Brian Wells, Michael was believed to have been in the area of the crime scene late Friday night or early Saturday morning.

But fairly quickly after Michael's name was printed in area newspapers, he came forward and willingly spoke with investigators.

It seems that after that conversation, authorities essentially ruled him out as being involved.

And a spokeswoman for the sheriff's office told the press that he was being cooperative.

In early November, authorities announced that Yavapai County's Silent Witness program was offering an up to $10,000 reward for information.

Coverage at the time indicates that the money was pulled together by Lisa and Brandon's family members, as well as other donors in the community.

A flyer advertising those funds featured the couple's photos, as well as a photo of Paula's white pickup truck.

Not long after that development, a few weeks into the investigation, law enforcement released information that piqued the press's interest.

It was a new detail that seemed to suggest the crime might have been related to an incident a day or so before the couple ever left to go camping.

Coverage by the Arizona Republic and East Valley Tribune states that sometime during the first few weeks of the investigation, authorities learned an argument had taken place in the doorway of the young couple's apartment between an unknown man and a young man who was seemingly Brandon.

This apparently occurred about a night or two before Brandon and Lisa left for their trip.