Two Florida cities have been hit by suspected serial killers in recent weeks. Homeless men were targeted in Ft. Lauderdale, with 3 men killed, while a killer in Tampa is believed to be responsible for a series of street shootings. Tampa police believe a body found Tuesday is a 4th victim of the serial killer in that city. Nancy Grace explores the investigations with Dr. Brian Russell, a psychologist and lawyer who hosts the ID channel's "Fatal Vows" series, forensics expert Joseph Scott Morgan, reporter Chuck Roberts and co-host Alan Duke.