SIN 34 was an American hardcore punk rock band formed in 1981 in Santa Monica, California, United States. The band was one of the first U.S. hardcore bands to feature a female frontperson, if not the first. The band's rhythm section would go on to form Painted Willie in 1984, and sign with SST Records in 1985, and embarking on a six-month national US tour with Black Flag in 1986. Reforming out of the blue in 2008, SIN 34 would once again play shows primarily in their native southern California through 2012. Longtime member and primary songwriter Phil Newman died after an apparent accident on a sail boat, February 22, 2015; the band has no plans to continue. Singer Julie Lanfeld-Keskin died April 4, 2018.