One month after a man fell to his death from the Houston Rodeo carnival's Hi-Miler roller coaster, KTRK Ch. 13 reports that a federal investigation into the accident is underway.

Forty seven-year-old Brian Greenhouse was killed on the final day of the rodeo March 20 when he fell off the roller coaster. Reports from the ride's operator and Rodeo officials have indicated that the portable ride had no malfunctions.

Experts for Ray Cammack Shows (the carnival's operator), the Greenhouse family and the Houston Livestock Show and Rodeo have already inspected the ride, but now the U.S. Consumer Product Safety Commission is looking into whether the ride was faulty.

This year, when the ride was taken down in Houston, it was not shipped to another fair. Instead, it's out of operation at the RCS home office in Arizona.

Both the Houston Rodeo and RCS officials say they will continue to cooperate fully with the investigation.

Watch the full KTRK report: