Article continues below advertisementHulk Hogan's cause of death being ruled as cardiac arrest didn't sit well with his family and wife, Sky Daily, leading the latter to launch a full investigation into potential factors that may have contributed to the WWE star's passing in July.In a new interview, Daily confirmed Hogan's neck operation in May "compromised" his phrenic nerve, a vital muscle responsible for breathing.Article continues below advertisementSky Daily to File Medical Malpractice LawsuitSource: @mrs.sky.