Richard Brian Suttles, who was shot by his aunt Mary Ann Holder died on Friday, bringing the death toll from last weekend massacre outside in Guilford, North Carolina, to six, including the shooter.

Richard Brian Suttles, 17, who had been shot on Sunday along with four other minors and one adult by his aunt Mary Ann Holder, died shortly before 1:00 p.m. on Friday, Guilford County Sheriff BJ Barnes said.

Along with Richard Brian Suttles, Mary Ann Holder killed her two sons, eight-year-old niece, and the 15-year-old girlfriend of one of her sons before killing herself.

Mary Ann Holder, 36, also shot her married lover, Randall Lamb, in the shoulder, and police say he’s expected to recover, the Associated Press reports.

She had been having an affair with Randall Lamb, 40, for almost 4 years, but it was coming to an end after months of bitter accusations between her, Lamb and his wife, including allegations of stalking and harassment.

Mary Ann Holder shot Randall Lamb on Sunday morning at a community college parking lot, and then drove away to pick up her son, 14-year-old Zachary Smith.

Within a half-hour, a sheriff’s deputy found Mary Ann Holder dead inside her SUV with a gun in her lap and her son mortally wounded in the back seat.

Police went to her home in the Pleasant Grove community south of Greensboro and found her son, 17-year-old Robert Dylan Smith, dead.

Her newphew, Richard Brian Suttles, 17, her son girfriend, Makayla Leigh Woods, 15, and her niece, Hannaleigh Suttles, 8, were all suffering from wounds that would prove to be fatal.

Along with Richard Brian Suttles, Mary Ann Holder killed her two sons, eight-year-old niece, and the 15-year-old girlfriend of one of her sons before killing herself

Hannaleigh Suttles died on Monday. She was followed by Mary Ann Holder son Zachary Smith a day later and Makalaya Leigh Woods on Wednesday.

The victims at Mary Ann Holder’s home appeared to have been shot while they slept in a bedroom and the living room, according to Chief Deputy, Col. Randy Powers. The woman left two notes taking responsibility for the killings.

Police officers found two handguns inside the vehicle, including one in Mary Ann Holder’s lap.

Police are continuing to investigate the case. An autopsy has been performed on Mary Ann Holder and police are waiting for the results of toxicology tests, but Col. Randy Powers said it initially appears there were no signs of drug use.

Mary Ann Holder, Randall Lamb and his wife had spent months trading accusations of stalking and harassment in court documents. Randall Lamb’s wife had recently threatened to file an alienation of affection lawsuit against Holder, investigators said.

Police are investigating a $10,000 cheque made out to Randall Lamb’s wife that Mary Ann Holder gave him the day before the shootings, according to an application for a search warrant obtained by The News & Record of Greensboro.

Police say the cheque may have been for an out-of-court settlement of some kind.

Despite that, and despite two notes left by Mary Ann Holder taking responsibility for the shootings, police say a definite motive is not yet clear.

“This will be the $64,000 question, because we don’t have anyone alive who can answer it,” Col. Randy Powers said.

“A couple of theories have gone up in the air, but we really don’t know yet.”

Mary Ann Holder reportedly had custody of her nephew and niece after their mother died.