Watch Live: Bishop Fenwick High School senior charged in random murder of woman in Danvers home due in court

Anthony DeMayo, an 18-year-old Bishop Fenwick High School student, will be in court Friday charged with the disturbing random murder of 68-year-old Janet Swallow in Danvers, Massachusetts.

DeMayo will be arraigned in Salem District Court, hours after Swallow was found stabbed to death in the bedroom of her home on Amherst Street Thursday. He's charged with murder and home invasion.

You can watch the arraignment live when it happens on CBS News Boston in the embedded video.

The investigation started Thursday afternoon when Lynn Police got a 911 call about a man with a knife walking on Standish Road. When police found him, they said they noticed blood on the knife and that he was acting erratically. According to court documents filed Friday, DeMayo confessed to a murder.

"As the investigation unfolded, DEMAYO informed Lynn Officers that he had killed a woman in Danvers the night before," the documents stated.

Because of his mental state at the time, police said they took him to Salem Hospital. Investigators also went to search his home in Lynn. Essex County District Attorney Paul Tucker said evidence led them to Swallow's home in Danvers, where police found her dead.

According to the court documents, DeMayo "told investigators that he planned on committing this act for a long time, and wanted to kill someone for a long time."

In the statement of facts filed by police, DeMayo "stated that he drove around surrounding communities beforere stopping in Danvers, in front of a home that was under construction with a gray porta potty out front. He then stated that he located a home to break into and he did so by climbing in through a window, ripping the screen from the window in order to climb through into the kitchen."

DeMayo, the filing alleges, "eventually located a woman sleeping in one of the bedrooms. DEMAYO then stated that he went into her bedroom and began stabbing her in the neck. After the knife became stuck, he pulled her off the bed onto the floor. After this act was complete, DEMAYO exited the home and drove his car back to his home in Lynn."

DeMayo was arrested at the hospital and charged with murder. He spent the night at the Danvers police station. He's a senior at Bishop Fenwick High School in Peabody. Police believe DeMayo acted alone.

"This was random. There was no connection between the defendant and the resident," Tucker said at a news conference late Thursday night. "He had no connection to the home."

Danvers Police Chief James Lovel said Swallow leaves behind two sons.

"This is a very difficult case because of the randomness of this violence," Tucker said. 

Danvers, Massachusetts is about 10 miles north of Lynn and 22 miles north of Boston.