Update, 4:30 p.m. Wednesday: New information obtained by Clarksville Now indicates that Konen’s father-in-law, 62-year-old David Rodgers, was beaten to death and not shot.

Update, 10:15 a.m. Wednesday: Matthew Konen is a paramedic Nashville Fire Department. He has been reassigned to “an alternate duty assignment where he was not working with the public nor responding to incidents during the ongoing investigation,” according to an NFD spokesman.

Previously: 

CLARKSVILLE, TN (CLARKSVILLE NOW) – The husband and son-in-law of the people killed in a January double shooting in the 500 block of Westwood Drive in the Sango area has been charged with two counts of criminal homicide.

Detectives with the Clarksville Police Department’s Special Operations Homicide Unit have arrested 31-year-old Matthew Konen in the shooting death of his wife, 30-year-old Rachel Konen and her father, 62-year-old David Rodgers.

The incident happened around 6:40 p.m. on Jan. 20, and was believed to be an isolated incident.

The information from Detective Michael Patterson during the initial investigation revealed that this was not a murder-suicide, but until now, the circumstances of their deaths had not been known.

Konen has been booked into the Montgomery County Jail.

WKRN, Channel 2 contributed to this report.