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Investigators say a son-in-law of the Wilson County couple killed when a package exploded at their home Monday has been arrested and charged with their slayings.

Richard Parker, 49, is charged with two counts of felony first-degree murder, two counts of premeditated first-degree murder and one count of unlawful possession of a prohibited weapon. Parker is being held in the Wilson County Jail on a $1 million bond.

His mother-in-law, Marion Setzer, 72, died at Vanderbilt University Medical Center Wednesday night from her injuries after the explosion at their home on Vance Lane. Her husband Jon Setzer, 74, died at the scene on Monday.

Parker lived behind the Setzers. The homes had different addresses but the houses shared a driveway.

Story: Fatal Middle TN explosion came from delivered package

In announcing the arrest, police would not discuss motive, the makeup of the explosive or whether additional charges could be filed. The investigation continues.

But "we believe we have the person responsible for that device on Vance Lane," Wilson County Sheriff Robert Bryan said.

The package that detonated and killed was placed at the home and not shipped, authorities said. Parker has one criminal conviction for arson in Giles County in 1993 and served four years probation.

The Setzers attended First United Methodist Church in Lebanon where Jon sometimes taught Sunday and Marion was trained in the Stephen Ministry that helped others going through difficulties.

"The grief is deep (and) profound because they were such wonderful people." said the Rev. Mike Ripski, the senior pastor at the church. "They lived out their faith. Two people targeted for this kind of violence doesn't make sense at all."

Jon Setzer was an attorney, who focused on estate planning and then concentrated almost exclusively on living trusts since the 1990s. His work included free seminars in Nashville that could generate clients.

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