PEABODY, Mass. (AP) — A suspect in a grisly double homicide was held without bail on Tuesday as authorities continued to search for an accomplice.

Not guilty pleas to two counts of murder were entered on behalf of Michael Hebb at a brief arraignment.

Hebb is charged with killing Mark Greenlaw and Jennifer O’Connor, who were found dead in a Peabody home on Saturday. The victims were dating and appeared to be living in the home, prosecutors said.

The scene in the cluttered home was so grisly that at first police could not tell how many victims there were. Autopsies have been scheduled to determine the causes of their deaths.

Hebb was arrested Monday at a Peabody apartment building. Hebb’s attorney did not argue for bail and said Hebb is cooperating with police.

“I’m sure there’s a story there,” defense attorney Raymond Buso said, without addressing specifics of the case.

The judge sealed the case at the prosecution’s request.

The bodies were found after a woman ran from the home, flagged down a car and was driven to a police station.

O’Connor’s father, Edward O’Connor, said her lifetime of health problems — including leukemia as a child, a stroke as a teenager and an almost fatal bout with a flesh-eating disease — led to drug and alcohol abuse.

Authorities have not released the name of the second suspect. Hebb is due back in court March

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