RICHMOND, Va. (AP) — -

Citing interference, the lead investigator of the events that led to an attack on a Virginia state senator by his son has resigned.

The resignation involves G. Douglas Bevelacqua, the director of the inspector general program for behavioral health in Virginia. In a letter to Gov. Terry McAuliffe, he writes that revisions by his boss would "diminish the report's" value as the state reviews the Nov. 19 attack on Sen. Creigh Deeds.

Austin "Gus" Deeds attacked his father with a knife at their remote Bath County homestead, leaving the elder Deeds with deep slashes on his face. His 24-year-old son then committed suicide.

Gus Deeds had been released from an expired emergency custody order 13 hours before the attack.

Inspector General Michael Morehart did not immediately respond Tuesday.

A spokesperson for Governor McAuliffe wrote: “The Governor is committed to reforming our mental health system so that it works to keep all Virginians healthy and safe. He thanks Mr. Bevelacqua for his service to the Commonwealth and will review the content of his letter.”