Michael Allen Muir (born March 14, 1963) is an American musician who is the lead vocalist of the Venice, California crossover thrash bands Suicidal Tendencies, Los Cycos and the funk metal band Infectious Grooves. He has also released several solo albums under his nickname Cyco Miko. Muir's trademark is wearing bandanas, jerseys with the number 13, and hats with block style letters that read "suicidal."
Born in Venice, California and raised in Santa Monica, Mike Muir is the younger brother of Jim Muir of the Dogtown skateboarding team. Jim exposed Mike to metal music as well as skateboarding. Muir attended Santa Monica College after being kicked out of school in the 10th grade. In 2003 Muir had his first of two back surgeries for a ruptured, herniated disc. The other, in 2005, caused him to cancel Brazilian festival dates and Suicidal shows. Muir is married and has three children. In early 2011 he returned to the United States after living in Queensland, Australia for a short period of time.