CASPER, Wyo. (AP) —Speeding likely played a role in a crash that killed a 22-year-old Casper woman and her 11-month-old daughter. Tianna Johnson was thrown from her car after veering off the road and sliding down a steep hill west of Casper on Thursday. Her daughter Tyler was flown to a hospital in Denver but was later pronounced dead. Witnesses say Johnson was speeding before going off a curve on Highway 220. Johnson was not wearing a seatbelt. Her baby was in a car seat.