A Louisiana couple is facing homicide charges after inflicting horrifying neglect on their 5-year-old son, who weighed just 19 pounds when he suffered a fatal “medical emergency” at a gas station earlier this month, cops said.

Marlon Perriloux, 33, and Raynisa Young, 27, were arrested after a speedy investigation into their alleged mistreatment that led to their son’s agonizingly slow death.

The Ascension Parish Sheriff’s Office was called to the filling station around 9 p.m. on Jan. 1 in response to a reported “medical emergency involving a juvenile.”

There, they found Marlon and his emaciated son, 5-year-old Marley Perriloux, according to a news release from the sheriff’s office.

Deputies tried to resuscitate Marley and handed him off to other first responders, who tried to perform “life-saving measures.” The boy was rushed to a nearby hospital, where he was later pronounced dead.

At the time of his death, Marley weighed just 19 pounds, the sheriff’s office said. It was unclear when he last ate.

Detectives with the sheriff’s office’s juvenile unit launched an investigation “immediately” after observing and receiving reports of neglect that Marley had suffered, including severe malnourishment.

The team executed a search warrant at the family’s home, which they determined “was in poor condition and barely livable due to [Perriloux] and Young’s negligence.”

Detectives learned in subsequent interviews “that both parents had failed to ensure proper hygiene, feeding, and medical care” for the child.

Many online observers were horrified by the couple’s alleged abuse. Some commented jabs aimed at Young, who wore a cold, dead-eyed stare in her mugshot.

“She looks demonic asffff,” one user wrote.

“I bet they were eating though. And don’t be complaining about that jail food,” another added.

The parents were arrested and are being held at the Ascension Parish Jail with no bond.

They face charges for negligent homicide, second-degree cruelty to juveniles, possession with intent to distribute marijuana, possession of drug paraphernalia, and illegally carrying weapons — with more or upgraded charges pending.