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 also used the facilities for events to raise money for civic groups in the area. Other beneficiaries included campaigns of the Fire Prevention Bureau of the city Fire Department and a memorial to firefighters killed in the line of duty.

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.