A top immigration official who shot himself while driving north of Tucson last year was seen trying to shred a large amount of documents before his death, records show. Whether or not the documents shed light on the suicide, those closest to Thomas DeRouchey say one thing is clear: He was deeply troubled by his agency’s handling of immigration enforcement in Arizona. "I believe Tom shot himself, but I don’t understand the reasons," said DeRouchey’s sister, Denise Salyers. "A lot of things don’t seem very kosher and I still wonder." DeRouchey, 45, was dedicated to his job as acting chief...