NASCAR Star Jimmie Johnson's In-Laws and Nephew Dead in Apparent Murder-Suicide

Jimmie Johnson is dealing with a family tragedy. The NASCAR driver's in-laws, Jack and Terry Janway, and 11-year-old nephew, Dalton, died on Monday after a shooting at their Oklahoma home, ET confirms.

According a press release from the Muskogee Police Department, dispatch received a 911 call at approximately 9:05 p.m. on Monday, where a female stated that there was a disturbance and someone had a gun, before hanging up.

When officers arrived on scene, they saw a subject lying in the hallway inside the front door, whom they later determined was deceased. Shortly after arriving, officers heard another gunshot from further inside the house.

When officers made their way inside, two more subjects were found deceased inside the residence. Jack, 69, Terry, 68, and their 11-year-old grandson, Dalton, died during the incident.

Dalton is the nephew of Jimmie and his wife, Chandra Janway, while Chandra is Jack and Terry's daughter.

According to TMZ, who was first to report the news, the tragedy is being investigated as a murder-suicide. The police department told the outlet that Terry is considered the suspect, but the motive is unknown and under investigation. It's unclear if Terry was the female 911 caller, the outlet reports.

Lynn Hamlin, PIO of the Muskogee Police Department, tells ET of the outlet's report, "Yes, I'm able to confirm that is correct information."

In the wake of the tragedy, Legacy Motor Club announced that Jimmie will not race this weekend.

"Legacy Motor Club has elected to withdraw the No. 84 Carvana Chevrolet from this weekend's NASCAR Cup Series event in Chicago," the club wrote on Twitter. "The Johnson family has asked for privacy at this time and no further statements will be made."

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