SPRING, TX (KTRK) -- Harris County investigators say a Spring couple's argument turned deadly late Friday night.The couple were arguing last night at their home on Crooked Post in Spring when things escalated.At some point, investigators say the woman shot and killed her husband, then called 911.So far, no charges have been filed.We're following this story on Eyewitness News. Watch for updates on air, online and on our mobile news app.