The officer approached Lopez, who then dumped the body in front of 42 Post Lane and fled, according to cops.
The victim, a woman in her mid-20s, was wrapped in a sheet and had bruising on her body, but it wasn’t immediately clear if the marks had anything to do with her death.
Police have not yet released the identity of the woman.
The cause of death will be determined by the city medical examiner.
Lopez allegedly called his brother and confessed to her death, according to a source.
The gruesome find rattled Post Lane residents, including Supreme Coleman, 30, who lives at the home where the body was found.
“Everyone was asleep in my house and then detectives knocked on the front door around 7 and woke us up,” he said. “We didn’t even know what was going on in the front.”
Coleman described seeing a plastic bag, a suitcase, rope and blanket.
“The body was dangling off the cart,” Coleman said. “He had stuff on top of the body — trying to camouflage it.”
Lopez has a lengthy criminal history, including 34 prior arrests, 15 of which are sealed. Those prior arrests include charges of robbery, theft and assault, police said.
The photo cops released of him was from his most recent arrest on April 30, on fare evasion charges in Brooklyn’s 73rd Precinct.
Anyone with information on Lopez’s whereabouts is asked to call the NYPD’s Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).