Autopsy Reports Detail Toxicology Results, Shooting Death Details of NASCAR Star Jimmie Johnson's In-Laws, Nephew

Autopsy reports obtained by Front Page Detectives show the young nephew of NASCAR legend Jimmie Johnson was tragically shot in the head and chest by his own grandmother, who went on a shooting spree and took the life of her husband before she killed herself.

On June 26, Johnson’s mother-in-law, Terry Lynn Janway, carried out the shooting spree inside the family’s Oklahoma home. Authorities were alerted when a woman made a brief 22-second phone call, chillying stating, “There is somebody here with a gun,” RadarOnline.com reported.

Responding officers found 11-year-old Dalton Janway dead with “gunshot wounds to the head and chest,” while his grandfather, 69-year-old Dr. Jack Lee Janway, died from a single gunshot wound to the chest, according to the autopsy report obtained by Front Page Detectives.

Both deaths were ruled a homicide. The autopsy report reveals Terry suffered from a self-inflicted gunshot wound to the chest and her death was ruled a suicide.

The report additionally mentions that the grief-stricken grandmother had experienced "blunt force injuries." The toxicology report indicates she was not under the influence of alcohol or drugs during the time of the shooting.

Johnson has been married to Janway’s daughter, Chandra, since 2004, and they have two children together. He withdrew from the NASCAR Cup race in Chicago after the shooting in Muskogee, which is about 50 miles southeast of Tulsa.

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Officials have not determined the motive for the shooting, but according to reports, Terry battled depression and was not able to cope with the skydiving death of her 27-year-old son, Jordan, in 2014.

USA Today reported that Jordan was unable to open his parachute after a mid-air collision with another skydiver and his emergency chute failed to deploy.