NASCAR driver Jimmie Johnson’s in-laws, along with one of their grandchildren, were found dead in Muskogee, Oklahoma on Monday night in what police suspect was a murder-suicide.

The Muskogee Police Department said in a statement that three people were found dead inside a home on Monday night after receiving a 911 call at around 9:05 p.m. over reports of a disturbance and someone with a gun. Once on the scene, police saw a person “laying in the hallway inside the front door.” Soon after, they heard a gunshot from further inside the home. The deceased were identified as 69-year-old Jack Janway, his wife, Terry Janway, 68 — the parents of Johnson’s wife, Chandra — and their 11-year-old grandson, Dalton Janway (Chandra’s nephew). Law enforcement officials said that Terry Janway is a suspect, but the investigation is still ongoing, with no motive known yet. Johnson has been married to Chandra since 2004.

On Tuesday, Legacy Motor Club announced in a statement that Johnson’s No. 84 Carvana Chevrolet will withdraw from NASCAR’s Cup Series event in Chicago on Sunday: “LEGACY MOTOR CLUB has elected to withdraw the No. 84 Carvana Chevrolet from this weekend’s NASCAR Cup Series event in Chicago. The Johnson family has asked for privacy at this time and no further statements will be made.”

NASCAR retweeted the Legacy Motor Club statement, but has not released anything further.

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