 Head coach Andy Reid named him the starter to begin the regular season, alongside free safety Husain Abdullah.In Week 4, he collected a season-high eight combined tackles in the Chiefs' 36-21 loss at the Kansas City Chiefs.On November 1, 2015, Parker recorded four solo tackles and made a season-high two sacks on Lions' quarterback Matthew Stafford during a 45-10 win against the Detroit Lions in Week 8.