A family is grieving after a man went on a stabbing spree in Manhattan Monday, which killed three individuals.

“What I want is for that bastard who took his life to rot,” Maria Lata said.

She is the aunt of Angel Lata Landi, a 36-year-old construction worker who was fatally stabbed while on the job site.

“He does not know the pain he causes us,” Lata continued. “I would like for some of his family to also go through the same thing.”

Landi’s death on West 19th Street was the first of three gruesome and fatal stabbings that all took place in Manhattan within three hours.

The man police said is responsible, 51-year-old Ramon Rivera, is charged with three counts of first-degree murder.

Rivera made his first court appearance Tuesday afternoon, where he was remanded into custody and ordered to undergo a psychiatric evaluation.

Authorities said Rivera stabbed Landi, of Peekskill, in Chelsea just before 8:30 a.m. on Monday. Landi was standing in front of his work site when Rivera attacked him, according to officials. 

According to investigators, two hours after the first incident, Rivera stabbed a 67-year-old man while he was fishing along the East River in Kips Bay. 

A half hour after the second attack, Rivera stabbed 36-year-old Wilma Augustin in near the United Nations at First Avenue and 42nd Street, police said.

According to police, Augustin lived in Chelsea at 38th and Sixth Avenue, the building that is a hotel-turned-migrant shelter in Chelsea.

After her stabbing, officials said a cab driver flagged down an officer about what he believed was a robbery and that officer arrested the suspect.

Rivera has been arrested eight times from December of last year to October of this year with crimes ranging from burglary, grand larceny and assault, police said.

His next court date is set for Nov. 22, the Manhattan district attorney’s office said.

Mayor Eric Adams said the city’s mental health system failed New Yorkers.

“That’s a wake-up call for our criminal justice system and our psychiatric system,” Adams said at his weekly press briefing.

Gov. Kathy Hochul called the attacks “abhorrent” and “unacceptable.”

She touted the fact that she has helped funnel one billion dollar’s worth of funds toward assisting in the mental health crisis in the state, but she said more needs to be done.

The family of Landi — alongside a representative with the nonprofit International Ecuadorian Alliance — said Adams, the city and the judicial system share the blame.

“If a person was arrested eight times, that person shouldn’t be on the street,” Walther Since, executive director of the International Ecuadorian Alliance, said. “If they have mental health, they should be in an institution. So I don’t know why the system got these crazy people out on the street.”

“He has committed many crimes,” Berta Landi, Landi’s sister, said. “He is on the loose, and it should not be like that. We need security for the city.”