Bryan Robinson, 41, was found dead after 10 p.m. on Saturday in a Milwaukee hotel room, according to ESPN.
The 14-year NFL veteran was found at Midpoint Motel in Milwaukee. Toxicology reports and autopsy results are still pending, but officials said no foul play was suspected, according to FoxSports.com.
Robinson played DE for the Bengals from 2005 to 2007.
Robinson played on the defensive line for five NFL teams since 1997: St. Louis Rams (1997), Chicago Bears (1998-2003), Miami Dolphins (2004), the Bengals and Arizona Cardinals (2008-10).