Pittsburgh Girl missing 50 + years no trace. But lots of theory's and another from Beaver County 4 years earlier never found as well

I was very young when Maryann Verdecchia  went missing after leaving for school and no trace of here has ever been found. My late friend Grizzly claimed the school janitor grabbed her and killed her and put her body in the school  incinerator to dispose of it.

The accused janitor is long gone and not talking and there was even a site dug up in Baldwin Boro near where a school on Brownsville road is  was where a man claimed when he was a kid he saw a minister bury
body near by but there has been so much ground movement there is no way to ever know.

http://news.google.com/newspapers?nid=1129&dat=19910423&id=zeFRAAAAIBAJ&sjid=bm4DAAAAIBAJ&pg=5494,6425459

 I know a Former  Scoutmaster who at one time was an auxiliary police officer who helped to look for Mary

 Ann and it haunts him to this day they could not find her.

http://www.wpxi.com/news/news/local/case-missing-pittsburgh-girl-remains-unsolved-50-y/nRB8f/

http://www.post-gazette.com/local/city/2012/06/07/After-50-years-search-continues-for-Mary-Ann-Verdecchia/stories/201206070305

http://news.google.com/newspapers?nid=1129&dat=19620705&id=15tRAAAAIBAJ&sjid=K2wDAAAAIBAJ&pg=7071,618278

 Some one knows what happened that morning but this is another case where only time will tell if remains are ever found. 
Whats even more interesting is the case of Rebbaca Triska who went missing in beaver County never knew about it till looking up Mary Anns case .

http://pennsylvaniamissing.com/triskarebeccaann.html

Again the question has to be asked if there is ,or has been an active serial killer or killers in these parts.