San Diego

A welder was killed at a construction site on Mission Gorge Road Thursday when a 2 1/2-ton earth-moving bucket fell on him, the county coroner’s office said. Ronald Gaston Ruby, 47, of Lemon Grove was welding the 6-foot-high bucket with a U-shaped bottom when--”for unknown reasons”--it tipped over onto him, apparently killing him instantly, Deputy Coroner David Lodge said. Ruby was pronounced dead at the scene. Officials of V.R. Dennis Construction Co., Ruby’s employer, could not be reached for comment late Thursday.