Alvero Diaz Juarez, 24, was last seen leaving his Knoxville, Tennessee home on December 1, 2007. He drove off in a blue van and said he was headed to South Carolina for a work engagement; no confirmed sightings of him or the van have been reported since that day. The disappearance went unreported to police until January 5, 2011, creating a long unexplained gap between his last known movements and the official missing-person report.

The Knoxville Police Department handled the investigation, which has passed through several investigators over the years but produced few concrete leads. Few details are available about where in South Carolina he intended to work or about his contacts after he left home, and the absence of communication from Alvero since December 1, 2007 remains the central mystery.

If anyone knew Alvero, his travel plans, where he worked in South Carolina, or saw a blue van matching his around December 2007, please come forward with information.