At a 1979 event, from left, Joey Ramone, Linda S. Stein, David Bowie, Dee Dee Ramone, his wife, Vera March, and, standing, Danny Fields.
Ms. Stein had many tumultuous relationships in her life, but investigators have not focused on any particular people, and did not comment on possible motives, a law enforcement official said. Investigators said they thought Ms. Stein was seen alive earlier on Tuesday, and they were trying to determine who was with her later that day.
A blind date with Seymour Stein, the founder of Sire Records, put her life on a new path into the popular music business. After their marriage, the couple worked together.
Ms. Stein was a co-manager of the Ramones as they helped spawn punk music and is credited with arranging their breakthrough performances in England. Her co-manager at the time, and a longtime friend, Danny Fields, attested to her forceful style. “She had powerful emotions,” he said, “and she didn’t appreciate being dissed or not having a phone call returned.”