By Tony Hanson

PHILADELPHIA (CBS) — A Philadelphia judge today found a former Kraft Foods company employee guilty of murder in a workplace rampage exactly two years ago in Northeast Philadelphia that left two women dead and a third employee wounded.

Witnesses say defendant Yvonne Hiller had long complained of abuse by fellow employees, claimed they were poisoning her by spraying her with chemicals including deer urine.

But authorities say the allegations were  investigated by police and OSHA and were determined to be unfounded.

Then, on September 10, 2010, according to a surviving victim, Hiller went berserk again, cursing and making accusations and threats.  She was suspended on the spot and escorted from the building.

But, the witness says, she returned minutes later with a gun, opening fire on several employees in a break room, killing Latonya Brown and Tanya Wilson, and wounding Bryant Dalton (see related story).

Dalton says the bullet went through his neck and lodged in his shoulder, and is still there.

In the one-day, non-jury trial, Common Pleas Court judge Benjamin Lerner found Hiller guilty of two counts of first-degree murder and one count of attempted murder.  The automatic sentence in life in prison, although formal sentencing will take place at a later date.