A 17-year-old boy is the sixth victim to die from injuries sustained in a weekend mass shootings carried out by Mary Ann Holder in Guilford County, N.C.

Authorities have said Richard Brian Suttles, who was shot by his aunt on Sunday along with four other minors, died shortly before 1 p.m. on Friday. An adult male who police said had an affair with Holder was also shot in the shoulder.

Before taking her own life, Holder, 36, shot Suttles, her two sons, an eight-year-old niece, and the 15-year-old girlfriend of one of her sons. She shot her married lover, Randall Lamb, 40, in the shoulder.

Police have told the media that Randall Lamb is expected to recover from his injury.

Authorities told The Associated Press that prior to her death, Holder was having an affair with Randall Lamb for almost four years. They said accusations between Holder, Randall Lamb and his wife, Jennifer, was causing the affair to come to a bitter end.

There were allegations of stalking and harassment within the murder-suicide case.

Police received word that Randall Lamb was injured around 9:08 a.m. when his wife called 911.

Jennifer Lamb reportedly sought a court order to keep Holder away from her and Randall Lamb in February. She noted in a complaint that Holder would constantly call and text their cellular phones and also sent nude pictures of herself.

Holder also filed restraining orders against Lamb and his wife in June. In her report she stated that they had stalked and harassed her and alleged that Lambs constantly drove past her house, according to The AP.

Jennifer Lamb was about to file an alienation of affection lawsuit against Holder, as North Carolina law allows for a married person who has been cheated on to sue the person with whom his or her spouse had an affair, according to reports.

Police said Randall Lamb agreed to meet Holder at the community college Parking lot where she shot at him multiple times, before he was hit in the shoulder.

Holder then drove away to pick up her 14-year-old son Zachary Smith, The AP reported, noting that within 30 minutes, a sheriff's deputy found Holder dead inside her SUV with a gun in her lap and her son fatally wounded in the back seat.

When police went to Holder's Pleasant Garden home they found her other son Robert Dylan Smith, 17, dead. They also found Suttles, Dylan's girlfriend, Makayla Leigh Woods, 15, and Holder's niece, Hannaleigh Suttles, 8, suffering from gunshot wounds that turned out to be fatal.

The eight-year-old girl died on Monday. Zachary Smith succumbed to his injury a day later and Woods died on Wednesday.

Police told The AP that the victims at Holder's home seemed to have been shot while they were sleeping.  Authorities said Holder left two notes taking responsibility for the killings.

The investigations continue, but on Tuesday Guilford County Sheriff B.J. Barnes said authorities may never know exactly what Holder's thoughts were and why.