ALLENTOWN, Pa. -

A Pennsylvania deputy attorney general and former Lehigh County deputy district attorney was one of three people killed in Monday's accident on Interstate 78 in Berks County.

Those who worked with Bob Rosner said his death is a great loss, not only for his family but for the law enforcement community, as well.

"Bob Rosner was a true public servant; a Marine, who began his career as a police officer, went to law school, and served dutifully as a deputy attorney general," said Attorney General Kathleen Kane. "He was an American hero who lived the American dream. Our hearts hang heavy over his passing and our thoughts and prayers are with the Rosner family."

During an award ceremony Wednesday, Lehigh County District Attorney Jim Martin was unable to hold back his emotions as he asked for a moment of silence in Rosner's memory.

"I can assume that it is legitimate to say he was killed in the line of duty," said Martin.

Working out of the attorney general's Allentown office, Rosner, 52, was actively involved in prosecuting drug cases.

Rosner, of Sellersville, Bucks County, leaves behind a wife and two sons.

"The law enforcement community lost a pretty powerful ally with Bob," said Terry Houck, first assistant district attorney in Northampton County, who first worked with Rosner during a cold case in 1991. "He's the rare breed of investigator that was able to keep his emotions aside; always knew the right thing to do and did it."

Houck said he felt "a profound sense of loss."

"His priorities were always in order, always, he always talked about his family," Houck said.

Rosner began his law enforcement career as a Warwick Township police officer before going to law school.

Edward and Theresa Dearden, a husband and wife from York County, also were killed in the fiery accident, which involved a tractor trailer and six other vehicles.