Legacy Motor Club has withdrawn the No. 84 Chevrolet of Jimmie Johnson from this weekend’s NASCAR Cup Series race on the streets of Chicago following the death of three of Johnson’s family members.

Muskogee, Oklahoma, police are investigating the shooting deaths of Terry, Jack, and Dalton Janway in what is believed to have been a murder-suicide. Terry and Jack are the parents of Johnson’s wife, Chandra. Dalton is their 11-year-old grandson and Chandra’s nephew.