The Queens landlord accused of stabbing his girlfriend and two tenants to death blamed the grisly slayings on “a lot of pressure” Wednesday — as cops searched his car for the missing murder weapon and his bloody clothes.

David Daniel, 54, wearing a white Tyvek suit, held his head down as police led him out of the 113th Precinct stationhouse, one day after arresting him in the gruesome killings.

“Why did you do it?” a Post reporter asked Daniel.

“A lot of pressure,” he answered.

“Did you say a lot of pressure?”

“Yeah,” the accused killer replied. “Pure pressure.”

Cops took Daniel into custody after he walked into the precinct at around 7:05 a.m. Tuesday and told an officer that he was “having issues” with his tenants, who were late on their rent, according to NYPD officials.

“I did something bad,” he allegedly said.

Cops responding to the single-family home in the St. Albans neighborhood found Daniel’s 51-year-old live-in girlfriend — identified as Coleen Fields — lying face-down in a second-floor bedroom with her throat slashed and multiple stab wounds, including to her left breast, law enforcement sources told The Post.

The tenants, Wayne Thomas, 57, and Evette Sweeney, 55, were discovered dead in the basement, each with multiple stab wounds.

Surveillance footage obtained by cops showed Daniel leaving the home around 6:20 a.m., carrying a black garbage bag into his gray 2015 Nissan Murano and driving off, according to sources.

Cops were searching the car, which was still parked at the precinct Wednesday and appeared to be well-kept.

NYPD officials said Daniel was eerily calm as he confessed to cops “that he killed three people and he gave the location and that he left the backdoor open,” recounting the crime in a “very matter-of-fact” way.

He stood stone-faced inside a Queens courtroom later Wednesday afternoon as he was arraigned on three counts of second-degree murder and one count of criminal possession of a weapon.

“The bloody crime scene was the result of extraordinary brutality,” Queens District Attorney Melinda Katz noted in a statement following the hearing, saying that her office would show in court that Daniel had “viciously stabbed his defenseless victims to death.” Judge Scott Dunn ordered Daniel held behind bars without bail, pending a return to court on Friday.

Fields’ ex-husband said Wednesday the death of the “loving and gentle person” was devastating, shocking and hurtful.

“Despite what you’re going through, you don’t murder your girlfriend,” Steve Fields, 63, told The Post. “You have issues with the tenants. It has nothing to do with her.”

Fields said he was with the slain woman for 10 years before they split in 2019 and divorced two years later — and said he never met Daniel.

Several neighbors in the St. Albans neighborhood, where Daniel bought the single-family home in 2017, said they also were shocked by the crime and recalled the accused killer as quiet and cordial.

Several neighbors in the St. Albans neighborhood, where Daniel bought the single-family home in 2017, said they were shocked by the crime and recalled the accused killer as quiet and cordial.

“I didn’t know he had tenants living there,” one local said Wednesday. “I never saw them.

“The whole thing is tragic. He could have found another way to deal with his problems,” she said. “He has ruined his life. I don’t see him ever getting out of jail. He killed three people.”

Additional reporting by Valentina Jaramillo