A spokeswoman for the Delaware County medical examiner says the pituitary gland of 51-year-old Mark Geisenheyner was removed during an autopsy and sent for tests.
Spokeswoman Trish Cofiell (COH'-feel) said Wednesday the coroner also is awaiting other medical records on Geisenheyner, which could take weeks.
Geisenheyner was killed in a standoff with police July 4, two days after he shot five people in neighboring Montgomery County, in suburban Philadelphia.
Authorities say Geisenheyner was seeking revenge over an insurance scam when he barged into the vacation home of a New York City couple and opened fire. A 2-year-old Massachusetts boy was among three people killed.
