Plymell, KS – A second member of a western Kansas family has died after an explosion at their home last month.

Garden City Fire Chief Allen Shelton says 14-year-old Riley Unruh died Tuesday at a Wichita hospital. His 17-year-old brother, Spencer Unruh, died in the explosion June 28 in Plymell, about 10 miles south of Garden City.

The boys’ mother, Kelly Unruh, remains in critical condition from injuries she suffered that day.

Investigators say the explosion was caused by a concentration of natural gas. Chief Shelton says investigators have not determined why the natural gas concentrated at the home.

Family members said in a statement that they were saddened by Riley’s death but rejoice that he is now in heaven with his Savior and his brother.