Dolphins sign Marvin Austin Posted Sep 24, 2013 Jason La Canfora of CBS Sports reports that the Dolphins have signed defensive tackle Marvin Austin. Austin was one of several free agent defensive linemen to work out for the Dolphins near the end of last week. Austin was a second-round pick of the Giants in the 2011 draft despite missing the entire 2010 season at North Carolina serving an NCAA suspension. (NBC Sports)