florida made sense for the very tight time line of the crime to work. he either flew into orlando or into tampa. all theory. meanwhile, the murder investigation at erie manufacturing was getting colder and colder. >> this case then hit a brick wall, huh? >> as far as a brick wall, we were still doing background on any and everybody connected to nelson serrano. >> one of those people connected to serrano was a nephew in florida named alvaro penaherrera. the detective could not figure out why serrano had called his nephew so frequently around the time of the murders. >> the day of the homicide, nelson had called him around 7:53 a.m. there was a series of phone calls that connected the two. >> then detective ray's team came up with a bingo moment. the discovery of a credit card transaction for serrano's nephew on a most interesting day and for the detective in a most interesting place.