Updated on Nov. 25 at 6:31 p.m. ET: Mary Ann Holder: 6 Now Dead in North Carolina Shooting Massacre

An 8-year-old girl is the third person to die from wounds received during a mass shooting carried out by Mary Ann Holder in Guilford County on Sunday morning. 

Police said Hannaleigh Suttles, one of two children Holder took in last spring when her sister died, succumbed to the head wound on Monday.

Authorities said Holder, 36, from Greensboro, shot six people before turning the gun on herself on Sunday. They believe the mass shootings and suicide is the aftermath of a bitter love triangle.

Guilford County Sheriff B.J. Barnes said Holder shot her two sons, her son's girlfriend, a niece and nephew, and a man she had an affair with before killing herself. 

Authorities said that 17-year-old Robert Dylan Smith, died from a gun shot wound to the head. Holder's other son Zachary Lee Smith, 14; her nephew, Richard Brian Suttles, 17, and Dylan's girlfriend Makayla Leigh Woods, 15, are listed in critical condition.

Barnes said all of the children were shot in the head. 

The sixth victim, Randal Lamb, 40, was shot in the shoulder.

Barnes told the media that Lamb and Holder had an affair that seemed to have ended in a bitter break up. 

He told digtriad.com that Sunday's shootings is One of the worst situations I've seen in my 30 years in law enforcement. 

We've got a situation basically that no one could ever imagine would happen here in Guilford County, Barnes added. This is the type of thing that you read about and hear about coming from California or New York or someplace like that. But it's right here.

Barnes said Holder left notes taking responsibility for the shootings before killing herself.

Reports are that around 9:08 a.m., deputies received word of Lamb's injury through a 911 call that came from Lamb's wife. Lamb reportedly told his wife that he was shot near the GTCC Aviation Center. Investigators theorize that Lamb was wounded around 8:52 a.m.

Barnes said that Lamb and Holder's past affair led to a lawsuit that included allegations of alienation of affection.

According to The Associated Press, in February, Lamb's wife, Jennifer, sought a court order to keep Holder away from her and Lamb. Jennifer Lamb noted in the complaint that Holder would constantly call and text their cellular phones. She also claimed that Holder also sent nude pictures of herself.

Holder then filed restraining orders against Lamb and his wife in June, stating that they had stalked and harassed her. She also alleged that Lamb constantly drove past her house, according to The AP.

Authorities told the media that Lamb agreed to meet Holder at a community college parking lot around 9 a.m. on the day of the shootings and that his wife was about to file an alienation of affection lawsuit against Holder.

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.

Holder reportedly shot at Lamb multiples time, hitting him once in the shoulder.

Shortly after 10:11 a.m. a deputy saw Holder's car on Remora Road and approached the vehicle and saw a puff of smoke and believed the suspect shot herself at that time.

Holder was found dead in the car and authorities also Zachary Smith with a gunshot wound to the head in the backseat. Investigators then went to Holder's house on Cocoa Drive where they found Dylan dead of a gunshot wound to the head, Hannaleigh Suttles, Woods and Richard Brian Suttles also with shots to the head. 

We may never know exactly what her thoughts were and why, Barnes said.