Nick Reiner was behaving strangely at a Conan O’Brien's party the night before his parents died

Two sources telling NBC News that Nick was being disruptive and behaving strangely at a gathering Saturday night that he attended with his parents at Conan O'Brien's house. The following day, authorities responded to an emergency call from the Riners Rentwood home. >> Verifying we have two cardiac arrests.Once inside, authorities say they discovered the deceased couple, arresting Nick just hours later near USC's campus in downtown. ...