If Patrick B. Drum had a particular dislike of sex offenders, his family didn't know about it, his mother said on Monday.

"Something must have happened that we don't know about," said his stepmother, Suzanne Drum, of Arizona. "Maybe they did something to set him off or he learned something that really bothered him."

Drum, 34, of Sequim, was arrested Sunday in connection with the shooting deaths of two registered sex offenders after a massive manhunt in a heavily wooded area near Port Angeles. He was being held without bail.

Clallam County Prosecutor Deborah Kelly said she plans to charge Drum on Wednesday with two counts of first-degree murder, unlawful possession of a handgun and burglary.

Drum is suspected of killing his housemate, 28-year-old Gary Lee Blanton Jr., who was convicted of third-degree rape in 2001, and Jerry Wayne Ray, 56, who was convicted of first-degree child rape in 2002.

Both men were level 2 sex offenders, deemed moderate risks to reoffend.

A clear motive for the slayings is not yet known, according to Jim Borte, a spokesman for the Clallam County Sheriff's Office.

According to the affidavit of probable cause that outlines the Sheriff's Office's case against him, Drum had been renting a house in Sequim and Blanton began renting a room in the same house about two weeks ago.

Emergency dispatchers in Jefferson County received a 911 call at 9:26 p.m. Saturday from a man who said, "Help, 911, I'm being shot." Silence followed, court documents say.

The call was tracked to an area in Sequim, but deputies were unable to locate the source and no one answered the phone when authorities tried to return the call, according to the affidavit.

Early the following morning, deputies were summoned to a home in Port Angeles, where residents had reported a suspicious man sitting on their porch, court documents allege. The homeowners told deputies the man introduced himself as "Patrick" and told them they had nothing to worry about and then walked away, investigators said in court documents.

An abandoned car, which had been rented to Drum, was found nearby. Inside, deputies found a note apologizing for "disturbances" he'd caused and an empty box of 9-mm ammunition.

An hour later, deputies were called to another Port Angeles home, where Ray's body was found.

The victim's father, Paul Ray, said in a telephone interview on Monday that he'd heard noises in the middle of the night but didn't get up because he thought it was just his dogs making a ruckus. When he awoke, he found his son dead.

"Somebody broke the damn door into my house and shot Jerry right in the bedroom," said the elder Ray.

Deputies then went to Drum's home, where they discovered Blanton's body, court documents say.

Drum was arrested after a manhunt of more than three hours that ended east of Port Angeles. According to court documents, Drum was armed with a 9-mm handgun and a knife.

Court documents and state Department of Corrections (DOC) records indicate that Ray was convicted of two counts of first-degree child rape. As a first-time offender, he qualified for an alternative sentence and did no prison time, according to the DOC.

It is unclear how much time Blanton served after his 2001 conviction for third-degree rape, but DOC spokeswoman Selena Davis said he was in prison from 2005 though 2010 after he was convicted of first-degree attempted kidnapping. He was also charged in 2011 with second-degree assault of a child, but the case had not been resolved.

Drum was in prison from 1998 to 2004 on convictions for check forgery, witness tampering, burglary and drug possession, according to the DOC. He served another four years between 2005 and 2009 for burglaries in Jefferson and Kitsap counties.

Last year, he was profiled in a Peninsula Daily News article in which he spoke openly about his addictions and how his work as a field hand at Nash's Organic Produce had given him a chance to succeed. "I want to be an example," he told the newspaper in September.

A manager at Nash's declined to comment about Drum other than to say he had not worked at the farm since last year.

Christine Clarridge: 206-464-8983 or cclarridge@seattletimes.com

Seattle Times news researcher Miyoko Wolf contributed to this report, which includes information from Times archives.