California engineer poisoned his colleague for 18 months, police say. He’s charged with attempted murder

N'dea Yancey-Bragg   Updated 12:08 p.m. ET April 4, 2019 Court documents show the alleged poisoning went on for 18 months. USA TODAY   An engineer in California has been arrested on suspicion of trying to kill a co-worker by poisoning her for more than a year. Berkeley police arrested David Xu, 34, last week on…