NASCAR driver Jimmie Johnson’s in-laws died Monday in a shooting that police are calling a murder-suicide, according to a report from TMZ.  Johnson’s 11-year-old nephew also died.

Muskogee Police in Oklahoma told TMZ that Chandra Janway’s parents, Jack and Terry Janway, and nephew, Dalton Janway, were found dead shortly after 9 p.m. Monday. The police said a woman called 911 to report someone with a gun before hanging up the phone.

Police said they did not have a motive and the shooting remains under investigation. 

Johnson — a seven-time Cup Series champion — married Chandra in 2004. They have two daughters.

Johnson is currently slated to compete in this weekend’s NASCAR Street Race in Grant Park.