The FBI has stepped up its efforts to catch the deranged killer who fatally stabbed a coworker and her 6-year-old son at a South Jersey apartment complex, offering a $50,000 reward for information leading to his capture.

Nazeer Hameed, 37, killed the mother and son in March, 2017 at the Fox Meadow Apartments in Maple Shade, where he and the victims both lived, but fled to India six months later, authorities said.

He was charged years later in abstentia after DNA testing linked him to the crime, officials said.

Authorities said they still don’t know the motive for the slayings of Sasikala Narra, 38, and her young son Anish.

Hameed became a person of interest in the case when investigators learned he had been accused of stalking Narra.

Narra’s horrified husband discovered the bodies of

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