The personal representative of Derek Boogaard’s estate sued the National Hockey League in the Daley Center, contending the NHL is liable for the hockey player’s accidental death from a Percocet overdose. It happened during an unchaperoned leave from a facility where he was being treated for opioid addiction because of the league’s alleged negligence in performing a voluntary undertaking. Boogaard reportedly participated in the “substance abuse and behavioral health,” or SABH, program that …