New England Patriots cornerback J.C. Jackson is dealing with mental health issues, according to his agent Neil Schwartz. Jackson was active for the team's game against the Kansas City Chiefs but did not play and wasn't spotted on the sidelines. Coach Bill Belichick simply stated that Jackson wasn't available and did not provide further details. Undrafted rookie Alex Austin started in Jackson's place. Jackson's absence left the Patriots shorthanded at cornerback, and they ultimately lost to the Chiefs. Jackson, who was acquired from the Los Angeles Chargers in a trade, has started six games this season and has 25 tackles and six passes defended.