PEABODY — Authorities on Tuesday revealed the identity of the second suspect being sought in the slayings of a Peabody couple over the weekend and warned the public that he should be considered armed and dangerous.

An arrest warrant was issued for Wes Doughty, 39, who most recently lived in Danvers, according to the Essex district attorney’s office.

Doughty faces two counts of murder in the killings of Jennifer O’Connor, 40, and Mark Greenlaw, 37, who were found dead Saturday night in a home on Farm Avenue.

He should not be approached, the DA’s office said, as it released several photographs of him and urged the public to alert authorities if anyone sees him or knows his whereabouts.

Officials announced their search for Doughty hours after Michael Hebb, 45, was arraigned in Peabody District Court charges that he killed the couple. Police arrestedHebb on Monday, taking him into custody without incident with assistance from a SWAT team.

No details of the crime were described in court, and Judge James Barretto granted a prosecution request to seal Hebb’s arrest affidavit. In a statement, prosecutors said the state medical examiner hasn’t determined how O’Connor and Greenlaw were killed.

Authorities announcing the hunt for Doughty did not describe his alleged role in the slayings.

Court records show Doughty had some previous contact with police. He was convicted in 2005 of leaving the scene of property damage and reckless operation of a motor vehicle after crashing into two parked vehicles in Danvers the year before. A judge in that case sentenced Doughty to probation.

A telephone listing associated with Doughty was disconnected.

Hebb appeared in court dressed in gray sweatpants and with his long dark hair pulled away from his face. Not-guilty pleas were entered on his behalf, and his defense lawyer, Raymond Buso, agreed to have Hebb held without bail.

A probable cause hearing was set for March 28. Buso declined to discuss what he knows about the allegations against Hebb.

No one came to the door at Hebb’s Peabody home on Tuesday afternoon, but court records show he was familiar with the residence where O’Connor and Greenlaw were found dead.

In March 2016, Hebb was summoned to court on a charge of driving with a suspended license after an officer saw him pull into the driveway at 19 Farm Ave. and go inside the property, records show. The charge was later dismissed.

Hebb’s criminal history goes back to the 1980s and includes arrests for drug and assault offenses, court records show.

One woman who attended Hebb’s arraignment said she was there to support Greenlaw’s relatives. The woman, who gave her name only as Pam, said that Greenlaw was the uncle of one of her grandsons.

“I’m going to miss him,’’ she said. “He was a good person. He just had issues growing up.’’

Pam said she worries about Greenlaw’s mother.

“The family loved him,’’ she said. “He was very protective of his siblings and his mother.’’

Court records show that Greenlaw had run afoul of the law and received separate state prison sentences for armed robbery and a firearms offense.

No one answered the door Tuesday at a family residence in Peabody.

O’Connor’s relatives didn’t attend the court hearing. In an interview on Monday, O’Connor’s father, Edward, said that his daughter was a lovely person who had survived bouts with leukemia, a stroke, and even a flesh-consuming disease, but that she couldn’t overcome her battle with drug addiction.

Laura Crimaldi can be reached at laura.crimaldi@globe.com. Follow her on Twitter @lauracrimaldi.