Robert Diamond, 32, who had been fired from the warehouse in April, was held without bail in the Bucks County Correctional Facility on two counts of first-degree murder.

Diamond, 32 - who told police that he had been disciplined unfairly after he called a black coworker "boy" - is charged with murdering Reginald Woodson, 52, an African American union steward, at the Simon & Schuster book company's warehouse Friday.

Diamond, who is white, also is charged with killing Angel Guadalupe, 46, who had taken an extra job at the warehouse two weeks ago to help pay the mortgage on his family's Levittown house.

"We're still investigating the motive," Bucks County District Attorney Michelle Henry said yesterday, stating that it was unclear whether race had been a factor.

The investigation included a search of Diamond's Bristol home yesterday afternoon by borough police and county investigators. Police declined to say what they were looking for.

Catherine Guadalupe said she believed that her husband, a Puerto Rican, had been murdered "because of his skin color."

"I can't believe it," she said in an interview at their home. "A senseless crime. This is horrible for me."

Police said Diamond had shot Woodson, 52, once in the upper back as he tried to run into the warehouse.

Police said Diamond had fired on Guadalupe as the worker left the warehouse in an SUV. Guadalupe fell from the vehicle after he was hit, and then Diamond stood over him and shot him again, police said.

Guadalupe was shot twice in the head, Bucks County Coroner Joseph Campbell said. One bullet, apparently the first, struck Guadalupe's jaw and was not fatal, Campbell said. The other bullet hit the top of Guadalupe's head and killed him.

Whatever motivated the killings, the results were devastating for the families.

Guadalupe had brought his family to Levittown from North Jersey and bought their home about nine years ago.

He took a temporary job at Simon & Schuster while working full time at a Wal-Mart.

"We moved out here to get a better life," Catherine Guadalupe said. "This was his second job just to pay all the bills."

Guadalupe, the father of three grown children, also worked for many years in the past as a custodian in the Pennsbury School District.

His wife said she was unsure how she would make ends meet. He had no life insurance, she said.

In Willingboro, friends and neighbors crowded into Woodson's two-story house, trying to console the distraught family.

One person there said the family did not want to make any statements and was still trying to arrange the funeral.

Woodson had been a deacon at St. Paul's Baptist Church in Florence.

On the lawn of Woodson's home, there was sign with a cross.