Born in Manuʻa District, American Samoa, he moved with his family at age three to San Diego, California, and to Anchorage, Alaska, about a decade later.

[2] After graduation from high school in 1995, Tosi received a basketball scholarship to Butler Community College in El Dorado, Kansas, northeast of Wichita.

[3] In 1998, Idaho won the Big West Conference title and upset Southern Mississippi in the Humanitarian Bowl in Boise and finished with a 9–3 record.

[3][10] At the 2000 NFL draft, he was selected in the fifth round (136th) by the Arizona Cardinals, where he started ten games as a rookie and led the defensive line in tackles.

[11] Injured in his third season in 2002, and was diagnosed with a genetic defect in his neck, spinal stenosis, which ended his playing career.