I was driving down Malone Rd towards Oakbrook when I saw this happen. At first I thought it might be a plane/contrail, but the angle was strange. I kept watching and it was falling fast at that sharp angle to my left. Then it totally disappeared. Just thought it was weird. We do have planes fly frequently overhead due to our location between LoveField and Mckinney airports. This was not like anything I have seen in over 15 years of living here. Thanks!