A mechanical problem and strongly gusting winds caused a fatal boating accident at Smith Mountain Lake earlier this month, an official said.

Richard Smith, 64, of Moneta was killed after the boat, a handcrafted replica of an antique craft, capsized April 4.

Another man, David Reynolds, 44, of Grottoes, remains missing, said Lt. Karl Martin of the Virginia Department of Game and Inland Fisheries.

The boat overturned in the "S Curve" near channel marker R-17 as a result of high winds and a malfunction in the cooling system, Martin said.

The cooling device was pumping water into the boat, but not out of it, he said. The accumulating water weighed down the back of the craft and made it unstable in the high winds, which were gusting up to 30 mph.

Two men, boat owner Walter Curt, 49, and Dennis Zimmerman, 59, of Harrisonburg, survived the accident. It's estimated they were in the water for up to 30 minutes before being rescued by passing boaters.

The boaters also recovered Smith's body.

None of the four men onboard was wearing a life jacket, Martin said.

The submerged craft was found the day after the accident in a vertical position, bow up, about 30 feet below the surface of the lake.

Divers used air bags to raise the boat, a 33-foot wooden sport boat made by Hacker Boat Co. of Silver Bay, N.Y.

Officials with the department, as well as several people familiar with the boat, inspected it and found the malfunction, Martin said.

The finding completes the department's investigation, but recovery crews continue to search daily for Reynolds' body, Martin said.

Divers and sonar equipment were used early on in the search, but recovery efforts were hampered by deep, cold water and dead trees and buildings that still stand on the bottom of the man-made lake.

Reynolds was a sculptor in metal who owned Wild Things studio in Grottoes. He was also a groundskeeper at a farm in Rockingham County.

Smith, who took care of the boat for Curt, moved with his wife to Smith Mountain Lake from North Carolina more than a year ago.

He was a retired engineer and had recently earned his captain's license, authorizing him to operate boats carrying no more than six paying passengers on inland waters.