Bodycam footage reveals moment cops heard NASCAR star Jimmie Johnson's mother-in-law shoot herself

New bodycam footage shows the moment that responding officers heard the final gunshot in the horrific murder suicide that claimed the lives of NASCAR great Jimmie Johnson's in-laws.

The bodies of Jack Janway, 69; his wife Terry Janway, 68; and their grandson Dalton Janway, 11, were discovered in late June in Muskogee, Oklahoma, about 50 miles southeast of Tulsa.

Muskogee police spokesperson Lynn Hamlin said Terry Janway shot and killed her husband and grandson before shooting herself. Terry and Jack Janway are Johnson's wife, Chandra's, parents. Dalton was her nephew.

Police responded to the home after a woman called 911 to report a disturbance with a gun before hanging up, Hamlin said.

The new video shows police officers at the scene commenting that they could see Jack Janway's body in the living room of the home under a blanket. When they move to enter the home, after announcing themselves as police officers, a single gunshot can be heard.