Several people were injured, including Rep. Scalise.
As he was leaving the baseball field, Duncan said Hodgkinson asked him if the practice was Democratic or Republican congressmen.
House Majority Whip Steve Scalise was wounded along with four others.
The list on James Hodgkinson's notepad had the names of three GOP congressmen who are all members of the House Freedom Caucus - Reps.More news: Kashmir: At least six police personnel killed during militant attack in Anantnag
The handwritten list reportedly included the names of Alabama Rep. Mo Brooks, South Carolina Rep. Jeff Duncan and Arizona Rep. Trent Franks, who were all at the baseball practice, according to NBC News and CNN.
The FBI said in a joint statement with other law enforcement agencies Friday that it is continuing to process evidence in an effort to determine a motive in the shooting.
Contacted by AL.com on Friday, Brooks said he has been told to refer all questions to the Capitol Police for comment.
Franks was on the list but not on the baseball team.More news: Sandy Hook Group Dumps Megyn Kelly as Event Host
Investigators said they have not found any evidence indicating Hodgkinson planned the attack.
She said she last saw her husband in March, when he sold off some of his belongings and moved to Virginia "to work with people to change the tax brackets", Sue Hodgkinson said.
Scalise, 51, was in dire condition when he was first shot, but internal bleeding is under control and the prognosis is positive.
Lobbyist Matt Mika was shot multiple times and remains hospitalized.More news: White House, Pentagon to take regionwide approach in new Afghan war plan
"Many lives would have been lost if not for the heroic actions of the two Capitol Police officers who took down the gunman despite sustaining gunshot wounds during a very, very brutal assault", Trump said. Authorities were investigating Hodgkinson's social media posts, a cellphone, computer and camera.