Man charged in shooting deaths of Jefferson County couple

State police have charged a Cameron County man in the deaths of a Jefferson County couple, and are investigating him in two additional unsolved homicides.

Steve Patrick Rebert, 45, of Emporium, has been charged in the deaths of James Wayne Shugar and Victoria Lynn Shugar, state police said. Both were shot multiple times and were found in the basement of their Snyder Township home April 12.

During a search of Mr. Rebert's home, state police found evidence that potentially related to crimes in New York. They forwarded information to the New York state police, the Genesee County sheriff's office and the Orleans County sheriff's office "that related to two unsolved homicides dating back to 2005 and 2007," according to a state police release.

New York investigators said Mr. Rebert is a suspect in the November 2005 shooting death of 46-year-old Bill Fickel of Oakfield. Police in neighboring Orleans County say Mr. Rebert is also a suspect in the February 2007 shooting death of 47-year-old Kevin Smith of Shelby.

Mr. Rebert was an Oakfield resident who knew Mr. Fickel and and Mr. Smith and lived within a mile of each man. All three attended Clarence High School in suburban Buffalo.
According to the definition wouldn't this mean he is a serial killer if he did commit all of these murders? Anyone have any more information on this story?