RADNOR >> Karen Korfmann spoke to the Congressional Neuroscience Caucus and bared her heart.The Radnor resident explained to the lawmakers on June 20 that her ex-husband and "soulmate," Roger Korfmann, died of a fentanyl overdose after struggling with addiction to opioids since the mid-1990s.Roger Korfmann, 52, seemed to be on top of the world.