Mederos is a known member of the Eastside Lokotes Sureno (ELS) gang. He has ties to Washington State and the states of Guerrero and Morelos in Mexico. Mederos speaks both English and Spanish.

Caution:

Santiago Villalba Mederos, aka "Pucho", is wanted for his alleged involvement in several crimes committed in Tacoma, Washington, in 2010. In February, Mederos allegedly fired multiple shots into a random car, killing a 20-year-old girl and seriously wounding her brother. During a fight in March, Mederos allegedly fired a single gunshot towards bystanders, striking and killing an innocent 21-year-old male victim. Mederos was charged with multiple counts for both of these crimes in the Superior Court of Washington for Pierce County, and local arrest warrants were issued for him. On September 30, 2016, a federal arrest warrant was issued for Mederos in the United States District Court, Western District of Washington, Tacoma, Washington, after he was charged with unlawful flight to avoid prosecution.