A Marine allegedly stabbed his pregnant ex-wife to death following an argument on a bustling Hawaii highway — even as passersby and commuters hopped out of their own vehicles and desperately tried to stop him. Dana Alotaibi had opened up about the alleged abuse she’d faced in her marriage on social media before she was murdered on the H-3 Freeway on Wednesday night. Witnesses driving by at the time, several of who stopped in a bid to intervene, told authorities they “observed a male standing over a female, stabbing her multiple times,” Deena Thoemmes, homicide lieutenant of the Honolulu Police...