He returned to the Lions for their 2005 training camp and was signed to the practice squad after the preseason. He was later signed to the active squad for week 6 versus the Carolina Panthers. Martinez had his first NFL reception in week 8, an 11-yard reception against the Chicago Bears. After playing in the Lions' week 9 game against the Minnesota Vikings he was again relegated to the practice squad. He would be activated once more for the week 15 game versus the Cincinnati Bengals in which he returned 2 punts and appeared on special teams.[https://web.archive.org/web/20070211113022/http://www.detroitlions.com/bio.cfm?bio_id=261&section_id=15&top=0&level=2&season=8&stats=1]