There may be others.
The citizen sleuth who recently helped police identify the Son of Sam’s first true victim is now telling “very interested” cops to look for additional bodies around two key dates — Dec. 14, 1976 and Feb. 25, 1977, he told The Post this week.
That’s when serial killer David Berkowitz authored and dated two twisted letters — part of the “apartment writings” found by police in Berkowitz’s Yonkers digs following his Aug. 10, 1977 arrest — according to YouTuber Manny Grossman.
It was Grossman’s dogged detective work that led to the stunning revelation splashed across The Post front page last week that the 44.-caliber killer had one more victim than previously known, his first, and that his deadly spree had begun three months earlier than believed.
NYPD cold-case detectives concluded last week that Wendy Savino, now 87, was the first official victim of the “Son of Sam.”
“I identified a pattern where Berkowitz would go crazy about dogs barking, he would write a letter and go absolutely nuts,” Grossman told The Post.
The 51-year-old Bronx resident added chillingly, “There’s two letters in there. Both say ‘Today’s the day I will go and spill blood for Sam Carr.”
Berkowitz believed a demon lived in and spoke through a black Labrador retriever owned by his neighbor, Sam Carr.
Grossman believes there is an “established pattern” of Berkowitz “writing these letters, dating these letters and then going out and shooting.”
The YouTuber “presented the letters” to Bronx homicide detectives on May 28, the day before investigators interviewed Berkowitz at Shawangunk Correctional Facility in upstate Ulster County.
“Son of Sam” was set to strike again. Courtesy of Manny Grossman
“They were very interested in the theory. They wrote down the dates for sure. What they did afterwards I do not know,” Grossman said.
The NYPD did not respond to questions from The Post regarding additional Berkowitz victims.
Berkowitz previously left clues to his carnage in his letters.
Virginia Voskerichian — victim No. 9 and fatality No. 3 — was 20 years old when she was shot and killed by Berkowitz around 7:30 p.m. on March 8, 1977 on a quiet street in Forest Hills, Queens.
In a letter dated that same day at 9:15 a.m., Berkowitz wrote, “The dog is screaming for fresh blood and meat to quench his thirst and pangs of fresh blood” and later rages, “Today the demon has not stopped for a moment. How much blood does he want me to spill for him?”
Grossman pored over online files at thepeoplevsdavidberkowitz.com, which claims to be the “largest public repository of investigatory files and documents” relating to the “Son of Sam” case.
The treasure trove of information was obtained through the Freedom of Information Act and public records, the website says.
Grossman cold-called a retired Berkowitz detective in Yonkers and subsequently teamed up with the lawman’s son, Mike Lorenzo, also a retired Yonkers investigator.
“He started showing me his dad’s files and we just established a great working relationship and friendship and it led to a new analysis of the case,” Grossman explained.
“It was really Mike Lorenzo who came up with the philosophical framework that Wendy Savino fit. That Berkowitz was a stalking sniper who had other victims.”
The Manhattan-born, Riverdale-bred Grossman said he “grew up in a journalistic household.”
His dad, Jim, was a “big New York City PR guy” who had reporting stints with the Wall Street Journal, Charlotte Observer and San Juan Star.
“All I ever wanted to be was a rock drummer,” Grossman laughed.
The landscaper confessed he only started looking into the unsolved Savino shooting because he had time on his hands during COVID.
Berkowitz arrest.
Grossman is content with his 15 minutes of fame.
“I don’t expect to be part of their investigation, nor do I particularly want to,” he said of NYPD probers.
“I’m very happy with the way they handled the Savino case.”
In today’s high-tech world, the Son of Sam would have had a limited body count, Grossman theorized.
“It could never happen today because he might be able to do one, maybe two, but he would get photographed everywhere . . . especially crossing the bridges of New York City.”