Grim revelations have surfaced in the case involving a man accused of fatally stabbing his parents at their home in Pennsylvania, later allegedly killing his sister when she stumbled upon the horrific scene.

Kevin Castiglia, aged 55, is facing a slew of charges, including three counts of criminal homicide, three counts of corpse abuse, and three counts of reckless endangerment. The victims are identified as 90-year-old Fred Castiglia, 84-year-old Judith Castiglia, and 53-year-old Deborah Castiglia. Castiglia has been held in Bucks County jail since the tragic discovery of the bodies earlier this week.

The chain of events reportedly began on Sunday. According to court records and a report by Philadelphia’s NBC affiliate WCAU, Deborah Castiglia’s boyfriend became worried when he hadn’t heard from her since the previous day. He visited her home but found it empty, with her car missing.

Concerned, he proceeded to her parents’ residence on Heather Road in Churchville, Pennsylvania, where he noticed her maroon Kia SUV parked in the driveway. After knocking on the door multiple times and receiving no response, with the house in darkness, he decided to leave, though this was not the conclusion of his search.

Undeterred, the boyfriend returned the next day around 2:10 p.m. and knocked again. This time, the door was answered by Kevin Castiglia, according to authorities.

The suspect reportedly answered the door in a robe, and when the boyfriend said he wanted to speak with his girlfriend, Kevin Castiglia told him she wasn’t there and had likely gone on vacation. He apparently wasn’t finished speaking, allegedly pointing a “Psycho”-type chef’s knife at the boyfriend and warning, “Don’t ever come here again or I will kill you.”

The boyfriend is said to have left and called 911.

The Northampton Township Police Department reported responding to the home “for a well-being check” and that when they arrived, they were “confronted by an adult male armed with a knife.” Kevin Castiglia at this time reportedly held two knives, with one of them apparently having blood on it.

After Kevin Castiglia allegedly failed to answer questions about his family and pointed at least one of the knives at officers, they shot him with a stun gun, but he was apparently unfazed enough to pull the electrodes from his body and retreat into the house where he “barricaded himself.”

A standoff between the suspect and law enforcement lasted five hours, according to authorities, who said officers eventually entered the home and found Fred Castiglia’s and Judith Castiglia’s bodies in their master bedroom and Deborah Castiglia’s body in the kitchen. Kevin Castiglia was found inside of a second-floor bedroom and arrested.

While being treated at a nearby hospital, the suspect allegedly told the doctor, “I hurt someone,” per area ABC affiliate WPVI. Some hours later, his reported admissions apparently went further.

“I killed my parents in their sleep,” he said, according to court documents, as well as, “I killed my sister when she found them.”

Kevin Castiglia is being held by Bucks County authorities without bail. He appeared in court on Tuesday and is expected to return on Feb. 12 for a preliminary hearing. Investigators have not mentioned a suspected motive.