Thousands pay tribute to 9/11 first responder Luis Alvarez at funeral
01:49Luis Alvarez, a 20-year veteran of the NYPD, spent part of his life fighting for 9/11 first responders like himself to get funding from congress for medical costs. Alvarez was diagnosed three years ago with colorectal cancer. He died at the age of 67. NBC’s Stephanie Gosk reports.