W.H. SINNOTT who has been ill for some time past, died early yesterday morn. He was a native of Kings Co. and came to this city in 1860 when entered as a law student in the office of late W.C. STOCKTON. He was sworn in as attorney of the Supreme Court in October 1865 and two years later was called to the bar. He formed a partnership with James G. FORBES, Esq. and since the latter gentleman left the city to take up his residence in the States, Mr. Sinnott has practised alone.