The Long Island Stop & Shop grocery-cart worker who went on a murderous rampage — killing one worker and wounding two others — was a “troubled employee” who had previously made “unwanted advances” toward female co-workers and gotten into disputes with other staffers, authorities said Wednesday.

Gabriel deWitt Wilson, 31, was ordered held without bail Wednesday in connection to the shooting spree at the chain’s West Hempstead location.

“Gabriel was a troubled employee,” Det. Lt. Stephen Fitzpatrick, commanding officer of the Nassau County Homicide Squad, said at a press conference following the appearance. “In the months previous to this incident, he was having unwanted advances towards females that work there, he was having disputes with other workers and threatening them and he was brought into the management office several times.

“It was a female employee within the store that was complaining to management in regards to him kind of flirting with her, giving her gifts, unwanted gifts,” he added. “Almost like a sexual harassment type of complaint. Other employees, other shopping cart gatherers were complaining that he was being aggressive or threatening towards them.”

Wilson went into the management office Tuesday to speak with the manager about transferring to the Hempstead Stop & Shop, according to Fitzpatrick.

“It was not confrontational at that time, it lasted approximately one to two minutes, that conversation,” the police official said. “He left the building without any violence or anything else being said. Forty minutes later he returned to the building … He walked right up to the offices, opened fire on the five individuals there, causing the death and the injuries.”

He fired seven times at five people — fatally striking manager Ray Wishropp, 49, of Valley Stream, and wounding a 50-year-old man and a 26-year-old woman, both struck in the shoulder, officials said.

Wilson then bolted from the busy grocery store and was spotted heading toward Hempstead Turnpike, police said.

As cops urged the public to stay inside and area schools went into lockdown, Nassau police scoured buses for the suspect and began checking possible hideout addresses phoned in to 911.

Wilson evaded cops for about four hours before a SWAT team closed in and captured him as he tried to flee a building on Terrace Avenue in Hempstead, about two miles from the store, authorities said.

The .380 caliber semi-automatic gun Wilson allegedly used has not been recovered and detectives are retracing Wilson’s steps, according to Fitzpatrick.

Wilson was arraigned on one count of second-degree murder and two counts of second-degree attempted murder, according to a criminal complaint.

Wilson has a criminal record in Maryland, officials said. He was shot in the head during a Baltimore gun battle on April 21, 2014 — exactly seven years before the Shop & Shop shooting, according to Nassau County Police Commissioner Patrick Ryder.

In that incident, Wilson and another man allegedly opened fire at each other and suffered lower body wounds, the Associated Press reported. Attempted murder charges against Wilson, connected to that incident, were later dropped, according to records cited by the AP.

He was also arrested in connection to a July 2016 assault, and a May 2011 attempt to distribute narcotics in Baltimore, Ryder said.

“The defendant stated, while being read Miranda, ‘I’m no spring chicken,’ and your honor, that’s true,” Assistant District Attorney Jared Rosenblatt told Judge Chris J. Coschignano, of Nassau County’s Fourth District, during Wilson’s arraignment.

In Nassau County, Wilson was taken in for two separate mental health crises — one in Roosevelt in 2016, and in 2019 for another in Long Beach, officials said.