He returned to his apartment to film his final video entry .
: For Lopez, filming himself building the bomb was as significant as the act itself; he viewed the tapes as "documentation of a crime" for the FBI. The Final Day and Suicide Video Ricardo Lopez Suicide Video
He originally intended to send a bomb containing HIV-tainted blood but eventually settled on a device designed to spray sulfuric acid when opened. He returned to his apartment to film his final video entry