A 23yearold double murder suspect at the center of an ongoing manhunt may have previously shown warning signs on social media, according to videos and photos obtained by Inside Edition. Peter Manfredonia, a senior at University of Connecticut, allegedly killed two people before kidnapping a third, authorities said. His parents have publicly pleaded for their son to turn himself in. Authorities suspect writing scribbled on Manfredonia’s dorm wall refers to the Sandy Hook shooter Adam Lanza. #InsideEdition