The Bears terminated defensive lineman Israel Idonije's contract Thursday.
The Bears also signed undrafted free-agent defensive end Jamil Merrell and linebacker Conor O'Neill, and waived safety Sean Cattouse, quarterback Jerrod Johnson and tight end Fendi Onobun.
Idonije played for Detroit last season after nine years with the Bears. In 149 career games, he has 273 tackles, 29 sacks, 40 tackles for losses, six forced fumbles, six fumble recoveries, 36 special teams tackles and eight blocked kicks.
Merrill played at Rutgers, and O'Neill at Wisconsin.