A Spokane woman was arrested early Thursday in connection with the slaying of a pregnant Okanogan County woman earlier this month, and a Spokane man with an extensive criminal record is being sought as a suspect, authorities said. Tansy Fae Mathis, 29, was arrested in Spokane in connection with the killing of Michelle L. Kitterman, 25, of Tonasket, whose body was found along a driveway on Stalder Road near Tonasket on March 1, according to the Okanogan County Sheriff’s Office.