j j Blow of Club at Polls Kills Primary Worker; Assailant, Said to Be Detective, Flees Thomas Mulroy. 40 years old. a boiler-maker at the Brooklyn Navy Yard, died from a fracture of the skull early this morning, several hours after he had been beaten In a primary row In front of a polline place at Public School 14. Navy and Concord Streets, Brooklyn. According to "witnesses, the man who beat ilulroy was a police detective in plain clothe. The assailant disappeared after the affair.- His name was not made public. The troubla occurred .In the Sixth Election District of the First Assembly Uistrict. where thee was a contest between James J. Browne. Superintendent of Sewers, and Alderman Patrick H. Larney for Democratic State Committeeman. Mulmy was a worker for Lamcy. About 0 o'clock 'nig5 FX-KAISER wrUIELM" OWN STORY. TvfU.r Oerman Ksiaers own .tory adherents of both candidates engaged In a quarrel In front of the polling place. The row was at its height when an automobile drove up to the curb. A man j stepped out of the car and told the crowd on the sidewalk to move on. Mulroy. falling to obev his orders, the newcomer attacked him. Some witnesses say the detective struck Mulroy with a blackjack ; others say that he punched Mulroy on the Jaw. and the Jat-ter fell and struck the back of his bead on the curb. - Friends took Mulroy to his home at 17 Carlton Avenue. Brooklyn, in a taxlcab. He began to get worse about midnight and his wife telephoned to the Cumberland Street Hospital for an ambulance. When the ambulance arrived. Mulroy was dead. Assistant. Medical Examiner Dr. Charles Wucst will perform an autopsy today. A patrol wairon was sent from the Poplar Street station to the scene of the disturbance, but on its arrival the crowd had left, including Mulroy and his assailant.