A 54-year-old Las Vegas man committed suicide by shooting himself in the head in front of a law firm on Mountain Street Wednesday morning.The man was an unemployed clerk who had worked for the Clark County School District, Carson City Sheriff’s Captain Ken Sandage said.“He was obviously depressed,” Sandage said, adding that the man had a note on his body indicating he was depressed.A call from the law firm to the sheriff’s office came in about 10:45 a.m. The man did not have an appointment at the firm and made no attempt to enter the building.“This was a traumatic event …