Lighting on radio tower reportedly failed days before helicopter crashed into it, killing 4 people CNNFlashing lights on tower hit in deadly helicopter crash in Houston’s Second Ward had history of not working, SkyEye crew says ABC13 HoustonHelicopter that crashed in Houston, killing 4, was on an air tour flight NBC NewsHouston helicopter crash: NTSB investigators continue investigation into deadly crash FOX 26 Houston‘It evaporated’ | Witnesses talk about moment helicopter struck radio tower near downtown Houston KHOU.com