Fire marshals are investigating whether crack pipes discarded in a Bronx row house played a part in sparking a fire on Sunday that critically injured Dean Meminger, a former player for the New York Knicks. Investigators discovered several crack pipes inside 1308 Findlay Avenue, where the four-alarm fire began at 9:20 p.m. on Sunday, city officials said. Mr. Meminger, 62, lived on the second floor of the building and was unconscious when he was discovered in his room and pulled from the flames.