. >> reporter: brian cole was a minor league baseball player headed for the big leagues. was his brother. >> brian was actually on the 40-man roster for the new york mets organization. >> reporter: he says while driving home from spring training in florida, brian was forced to steer his 2001 ford explorer off the road to avoid another car. it flipped three times. brian was thrown from it and killed. everyone assumed he hadn't buckled up. that surprised greg who thought brian always wore his seat belt. then he made a startling discovery. >> the one thing we noticed when we opened the truck was the seat belt was still latched. that kind of raised suspicions in our mind. >> reporter: brian's family claims he was wearing his seat belt but it was defective and became so loose it failed to hold him in. that's because the belt was designed to lock into a firm grip when there's sudden movement, like during a collision. but the same belt could fail and go slack during the unpredictable forces of a rollover. brian's family sued ford. engineers used these illustrations to show that b