NEW YORK – Before his death in a fiery car crash, Michael Hastings was preparing to publish a major investigative piece tied to the undercover agent who is suspected of sanitizing President Obama’s passport records prior to the 2008 presidential election. The mystery has only deepened since the Los Angeles Coroner’s Office ruled that drugs in his system at the time of the June 18 crash, including amphetamines and marijuana, likely did not contribute to the crash. Hastings, 33 years old at the time of his death, wrote for Gentleman’s Quarterly, Rolling Stone and Buzzfeed, reporting on national security issues....