In an unlikely source, police were able to identify the suspect, who is believed to have killed two students at Brown University and then days later, gunned down a Massachusetts Institute of Technology professor, from a random tipster who had a strange encounter with with a man on a sidewalk.
Ever since a shooter unloaded more than 40 rounds inside a Brown engineering building, anxiety and frustration has plagued the Providence, Rhode Island, community as police appeared no closer to identifying the person.
