the in-laws of NASCAR driver Jimmie Johnson and his wife’s 11-year-old nephew were killed in a fatal shooting in Oklahoma Monday night that police are now investigating as a possible murder-suicide, according to police.

The Muskogee Police Department said in a statement obtained by Fox News Digital that three people were found dead inside a home Monday night after receiving a 911 call around 9:05 p.m. someone with a gun.

Jimmie Johnson, driver of the #48 Lowe’s Patriotic Chevrolet, celebrates with his wife, Chandra, at Victory Lane after winning the NASCAR Sprint Cup Series All-Star race at Charlotte Motor Speedway on May 18, 2013, in Concord, North Carolina. (Streeter Lecka/Getty Images)

According to police, the woman who called hung up after reporting the incident.

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Once on the scene, police saw a person «lying in the hallway inside the front door» and heard gunshots from inside the home.

The deceased were identified as Jack Janway, 69, his wife, Terry Janway, 68, and their 11-year-old grandson.

Jimmie Johnson and his wife Chandra pose for a photo

NASCAR Sprint Cup Series champion Jimmie Johnson and his wife, Chandra, are pictured before the NASCAR Sprint Cup Series Awards on December 2, 2016, in Las Vegas. (Brian Lawdermilk/Getty Images)

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FOX 23 Tulsa identified the victims as the parents and nephew of Johnson’s wife, Chandra Janway.

Police told Fox News Digital that they are investigating the fatal shooting as a possible double murder-suicide and that Terry Janway is being considered as a possible suspect.

Jimmie Johnson and his family at a NASCAR race

Jimmie Johnson, driver of the #48 Lowe’s Chevrolet, celebrates on Victory Lane with his wife, Chandra Janway, and daughter Lydia after winning the NASCAR Sprint Cup Series Folds of Honor QuikTrip 500 at Atlanta Motor Speedway on February 28, 2016, in Hampton. Georgia. (Todd Warshaw/NASCAR via Getty Images)

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The Legacy Motor Club issued a statement Tuesday to confirm that Johnson’s No. 84 Chevrolet Carvana will be retired from NASCAR Cup Series event in Chicago on Sunday.

«The Johnson family has requested privacy at this time and no further comment will be made,» the racing team said in its statement.