CONCORD, N.H. -- A New Hampshire parolee allegedly stabbed a convicted sex offender and police now wonder if he had plans to hurt other offenders.

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Jack Harper Reports On Arrest

Newscenter 5's Jack Harper reported that Concord police said when they arrested Lawrence Trant on charges stemming from an April stabbing, they found a list of convicted sex offenders in his room with check marks next to some of the names. The list remains the focus of a continuing investigation.

According to investigators, Trant, a former Massachusetts resident, believes all sex offenders should be killed and they are investigating whether Trant may have tried to hurt or kill sex offenders in the past.

"The night he stabbed the guy (in April), he came home and said he was going to work for the police department. He thought, in his mind, that he was helping to get rid of the pedophiles," said Trant's former landlord, Donald Chase. "We thought he was a nice guy except for that. We didn't know his history. We didn't know his background."

Trant is being held at Concord State Prison for allegedly attacking a man who was on the state's sex offender registry list.

"Lawrence Trant currently stands charged with attempted murder and alternative first-degree assault for a stabbing incident that occurred in Concord in late April on North Main Street here in town. The victim is an individual who is listed on the New Hampshire sex offender registry list," said New Hampshire Assistant General Jim Rosenberg.

Inside Trant's apartment, police found a copy of the state's sex offender list with several names with red check marks beside them. A police affidavit reveals three registered sex offenders had been living at 32 North Spring St., in Concord, the same address where there had recently been a suspicious fire -- a fire that police now believe Trant may have set.

"It was pretty scary. The whole room was filled with smoke. There was a lot of damage, we had to leave for two weeks afterwards for the damage to be repaired," said fire victim Cynthia Griffith.

In the 1980s, Trant was tried and acquitted of the Malden, Mass., murder of Bertha Smith, 82.