This journal article describes a longitudinal study of street youth ages 15 to 24 in San Francisco, California, from 2004 to 2011. From the original cohort of 218 participants, 11 youth died during the six-year study, which is nearly a 10 percent mortality rate. Most deaths were due to suicide and/or alcohol and drug abuse. This mortality rate is more than ten times that of the mortality rate of the general youth population in California. The researchers conclude that additional services and programs are needed to provide housing and substance abuse intervention to prevent premature deaths among this vulnerable population.