MESA, Ariz. - A 42-year-old man is accused of conspiring to kill his wife by poisoning her so that he could continue a long-term affair he was having, says the Mesa Police Department.For 6 months, Dallas Michaels would allegedly speak with a woman about killing his wife and collecting her life insurance money.Police say he wanted to give her a lethal dose of fentanyl in a drink.The woman told investigators of his plan on June 12th.On June 25th, investigators got hold of texts between Dallas and the woman where he said he was going on a family trip to California and was "doing it then."In a conversation between Dallas and the woman overheard by detectives, he reportedly said he arranged to buy fentanyl and was ready to finally kill his.