A note — maybe authored by the killer. Blood. Fingerprints. A bullet slug. Fiber and other trace evidence.

Those are among the clues state police investigators are poring through in hopes of solving last week's slaying of a well-liked Seneca Valley High School math teacher.

Eight days after 48-year-old Steven Russo was shot in the head at his log cabin-style rental home on Route 19 in Lancaster Township, police have yet to identify a suspect or any so-called “person of interest.”

But neither has anybody been eliminated as a suspect, Lt. Steve Ignatz said.

“There are a lot of people we're talking to and have talked to,” Ignatz said. “We've not ruled anyone in or out.”

Investigators are keeping most of their findings close to the vest. Most details — like a possible motive and any theories about the killing — are secret.

However, a single-page, typewritten note was found near Russo's body, but police have refused to divulge its contents.

Police say Russo's daughter found him dead about 11:25 a.m. Nov. 24 when she came to visit his home.