derril willard. but hotel employees later confirmed that the woman was ann miller. >> ann and derril ordered a lot of room service. >> just three days later when eric miller was in the hospital, investigators learned that his wife ann contacted another man with whom she was having an affair. a fellow scientist living in california. >> ann says, my husband is gravely ill. but if i could buy you a beach house and spend the night with you, i would do it in a heartbeat. >> she also said in that e-mail communication that he could call the house and they could speak by phone because their in-laws wouldn't know any better and they wouldn't suspect anything. >> no one knows if derril knew ann miller was involved with other men, but it was clear to investigators that derril willard and ann miller both had a motive to kill eric. at the pharmaceutical company where both ann miller and derril willard were employed, police found arsenic. >> they were using cacodylic acid to clean their glassware. and at first gla