Mika requires assistance to breathe and will need more surgery.
Before his time at Tyson, Mika worked for the The North American Meat Institute, an association representing the meat and poultry packing and processing industry, for two years, his LinkedIn profile shows.
New Orleans Mayor Mitch Landrieu is traveling to Washington, D.C. on Thursday (June 15) with plans to attend the Congressional Baseball Game at Nationals Park, a spokesman with the mayor's office said.
Walberg said he has known Mika, now director of government relations for Arkansas-based Tyson Foods' Washington office, since he came to work for him during his first congressional run in 2006.
Tyson Foods confirmed to CBS that Mika was in surgery after being transported to the hospital. Mika is a volunteer team coach.
The congressman said Mika's status as an "overachiever" goes back to his days playing football and baseball at Michigan's Adrian College.
Tonight the MI delegation and staff will wear white ribbons for our friend & fellow Michigander, Matt Mika.
The gunman, identified as 66-year old James T. Hodgkinson of Belleville, Illinois reportedly died from injuries he sustained after he targeted a baseball practice that included several members of Congress, staff and members of the U.S. Capitol Police, who fired back on the gunman.