New details in the investigation into a triple murder and arson in Pulaski, Tennessee. A second person is now behind bars.

18 year old Matthew Wood is charged with the deaths of 38 year old Deseree, 16 year old Jerrod and 9 year old Anthony Thornton. The family was killed in an October 23rd explosion at their home on Milky Way Drive.

Wood is charged with three counts of first-degree murder. He's being held in the Giles County Jail without bond.

Meanwhile, the other suspect in the case, 18 year old William Angel Jr. is also in the Giles County Jail without bond. He, too, is charged with three counts of first-degree murder.

Investigators believe the two teens targeted Jerrod Thornton and his family because he began dating one of their ex-girlfriends.