Watkins said he and Giovanna Cassilly were “cooperating with inquiries from law enforcement which includes local, state and federal” agencies.

But police spokeswoman Schron Jackson said Tuesday, “The incident is noncriminal, and there is no active investigation.”

Despite Jackson’s statement, the medical examiner’s office refused to provide the autopsy report to the Post-Dispatch this week, citing an open police investigation.

The FBI would not confirm or deny an investigation. But U.S. Attorney Richard Callahan said, “Certainly, our office never had anything open on it.” He added, “It’s hard to imagine what the (federal) jurisdiction would be.”

Police said homicide detectives responded to Cementland after the body was found Sept. 26, 2011, but decided it was not foul play.

Giovanna Cassilly said she was in California the day her husband died and questioned why she was never interrogated by police. She also said she believed her husband’s fatal head injuries — including a deep cut into his right side of his skull — could not have been caused by a tumbling bulldozer.

“The damage on Bob’s body does not match the dozer,” she said. “It can’t happen. It just simply can’t happen.”