Louis J. Principio Jr., a founder of Hammerjacks, the South Baltimore nightclub and concert hall, died at St. Agnes Hospital Tuesday of cancer. He was 67 and lived on Oakland Terrace Road in Arbutus.

A mass of Christian burial for Mr. Principio will be offered at 10:30 a.m. tomorrow at the Roman Catholic Church of the Ascension, Potomac and Poplar avenues in Halethorpe.

A native Baltimorean, he became a partner in the business, which now concentrates on concerts in its building at 1101 S. Howard St., when it opened as a tavern on South Charles Street in the late 1970s. He oversaw its operations until his death.

He is survived by his wife, the former Lydia J. DiPaolo; a daughter, Nicola P. Lind of Arbutus; a son, Louis J. Principio III of Arbutus; two sisters, Victoria Baker and Rose Fletcher, both of Baltimore; two brothers, Joseph and Vincent Principio, both of Baltimore; and five grandchildren.