A second man has pleaded guilty to manslaughter in a “highly unusual” case involving an industrial accident at Bennets Green more than five years ago. Richard Kevin Thirkell, of Newcastle, was a roof plumber on an Abdon Close worksite when Edgeworth mother Judith Davis, 41, fell 9.6 metres through a roof to her death on April 25, 2003. The cases are understood to be the first ever successful prosecutions of industrial manslaungter in NSW.