from the derry news , june 30th , 1958 ( page 5 ) : macklin questioned in deaths of grogan , clements produces unshakable alibis , source claims from the derry news , july 6th , 1958 ( page 1 ) : macklin to be charged only with murder of stepson dorsey , borton says edward corcoran still missing from the derry news , july 24th , 1958 ( page 1 ) : weeping stepfather confesses to bludgeon death of stepson in a dramatic development in the district court trial of richard macklin for the murder of his stepson dorsey corcoran , macklin broke down under the stern cross-examination of county attorney bradley whitsun and admitted he had beaten the four-year-old boy to death with a recoilless hammer , which he then buried at the far end of his wife 's vegetable garden before taking the boy to derry home hospital 's emergency room .