A gunman who killed a Bronx couple execution-style in front of their tot-sized son more than 30 years ago has finally been caught after he “spent decades hiding in plain sight,” authorities said Thursday.

William Antonio Solis, 62, was arrested in Florida and charged in the sickening 1993 double-slay of Luis Guerrero, 31, and his 28-year-old wife Danis Sime, who were bound and shot in the head during a robbery that turned deadly in a Morris Heights apartment, the feds said.

The case – which made headlines at the time after the couple’s orphaned toddler was found outside, screaming for his father – was finally cracked by NYPD detectives and federal investigators with the help of a fingerprint pulled from duct tape.

“For more than 30 years, this Bronx double murder has haunted a family and the people of New York,” said Manhattan US Attorney Jay Clayton in a statement.

“That ends today.”

Federal prosecutors said Solis and two accomplices, who were not publicly identified, cooked up the “planned robbery” of Guerrero, who was a drug dealer, at the apartment on June 21, 1993.

Guerrero showed up thinking he was there to sell two kilograms of cocaine — but Solis and the two other brutes instead aimed a gun at him and threatened to open fire if he didn’t follow their instructions, according to court documents.

When he refused, the trio wrestled Guerrero to the ground and restrained his hands with a wire hanger and duct tape, prosecutors said.

One of the perps then hauled Sime and the couple’s tot, who were waiting in their car outside, into the apartment, and then she was also tied up with duct tape, prosecutors wrote in a pre-trial detention letter to the judge.

“After a discussion about what to do, the defendant and his co-conspirators decided they had no choice but to kill Guerrero and Sime,” the letter states.

Solis then allegedly “stepped into a leading role,” shooting Sime in the head as she lay on a bedroom floor and firing at her husband while he was on the living room floor, the feds said.

The alleged killers took the child with them as they drove to the couple’s home, which they ransacked for drugs and money before leaving the orphaned boy alone in the apartment, prosecutors said.

The tot was later found by a neighbor standing on the lawn in front of the apartment, according to a Post article printed at the time.

“He was screaming ‘Daddy, Daddy,” neighbor Chris Anton told The Post back then.  

The victims’ bodies were found about 24 hours later.

Solis, a Dominican Republic native who became a US citizen in 2001, left the Big Apple about 18 months after allegedly carrying out the double-murder and landed in Tampa, Fla. — where authorities picked him Thursday, the feds said.

A fingerprint pulled from the duct tape helped crack the case when investigators matched it to Solis in June 2025, according to the detention letter.

“As alleged, William Solis spent decades hiding in plain sight more than a thousand miles from where he viciously murdered the Guerreros in front of their young child,” Homeland Security Investigations Acting Special Agent in Charge Michael Alfonso said in a statement.  

“This arrest is the result of years of meticulous investigative work by dedicated special agents and task force officers who refused to let this case go cold.”

It’s unclear if the two co-conspirators have been arrested. The Manhattan US Attorney’s Office declined comment.

Solis was charged with two counts of intentional killing while engaged in a narcotics conspiracy, which carries a maximum prison sentence of life or even the death penalty if he’s found guilty.

“Today’s indictment sends a clear message: the NYPD will always work to make sure criminals are held accountable, no matter how long it takes or how far they may run,” said NYPD Commissioner Jessica Tisch in a statement.