Marshall's contract now runs through the 2017 season. It is worth a reported $30 million, and Marshall's foundation tweeted Monday that he was donating $1 million to the "mental health community."
In 2011, Marshall disclosed that he had been diagnosed with borderline personality disorder. The 6-foot-4, 230-pound Marshall has a history of off-field problems, but the Bears have had no complaints.
In two seasons in Chicago, Marshall has been named to the Pro Bowl twice and ranked second in the NFL during that time in receptions (218), fourth in receiving yards (2,803), fifth in touchdown receptions (23) and tied for second in 100-yard receiving games (13).