Walt Disney World will keep a roller coaster closed through the summer as federal investigators continue examining the death of a resort mechanic who was killed while working on the attraction in March.

Disney recently extended the closure of Primeval Whirl, a spinning coaster in Disney's Animal Kingdom that has been shut down since January for maintenance, until at least Sept. 14. The reopening of the ride, initially scheduled for April, already had been postponed once, until early June.

The new date coincides with a six-month deadline facing the U.S. Occupational Safety and Health Administration to complete its investigation into the death of Russell Roscoe, a 52-year-old attractions mechanic who was struck by one of the attraction's ride vehicles on March 13. Roscoe, who lived in Sumter County, suffered a massive head injury and died the following day.

Disney said Tuesday that some of the planned maintenance for Primeval Whirl had to be pushed back to accommodate the accident investigation. The resort said the new reopening date is not related to OSHA's timeline.

"The refurbishment was delayed as a result of the investigation," Disney spokesman Andrea Finger said.

Resort officials would not say what changes they are making to the 9-year-old ride, nor whether they are making any safety adjustments. "It would not be appropriate to comment while OSHA is still reviewing the incident," Finger said.

It would not be the first time Disney has had to make safety upgrades to Primeval Whirl following an accident.