The Delaware County Medical Examiner is testing the brain of the man responsible for killing three in a shooting rampage.
On Saturday, July 2, ex-convict Mark Richard Geisenheyner took revenge on a New York man and his family and friends by shooting the man, Paul Shay, 64, and his nephew’s girlfriend and killing Shay’s nephew Joseph and his girlfriend’s son. Paul Shay’s wife Monica also died in the incident.
Geisenheyner died on Monday, July 4 in a police standoff in the basement of a home in Trainer, Delaware County.
According to authorities, the presumed killer had been planning Paul Shay’s murder for more than 15 months.
Investigators say that Geisenheyner told friends that he and Shay had cooked up an arson/insurance fraud scam that didn’t pan out, causing the ex-con to seek revenge on Shay.
A friend, Michael Madden tells the Delco Times that the day after the shooting, Geisenheyner made a chilling confession.
He also claims that a week before the mass murder, Geisenheyner told him that he was being treated for a pituitary tumor and that he was having blackouts and nosebleeds, according to the Times.
Now, the Delco Medical Examiner is testing the presumed murder’s brain for any tumors or brain abnormalities that could have led him to commit such a heinous crime.
He has already removed the pituitary gland and submitted it for histologic examination.
Dr. Fredric N. Hellman will also subpoena Geisenheyner’s medical records.
Dr. Hellman tells NBC Philadelphia that test results could take several weeks.
