The man accused of committing Philadelphia's Fourth of July shooting spree that left five people dead and multiple others injured allegedly killed one of the victims nearly two full days before the mass shooting, according to officials.

Kimbrady Carriker, 40, was arraigned Wednesday morning on five counts of murder, attempted murder, aggravated assault and weapons counts of possession without a license and carrying firearms in public, The Associated Press reported.

One of the five victims, 31-year-old Joseph Wamah Jr., was initially thought to have been killed in a home during the shooting on Independence Day, but Philadelphia District Attorney Larry Krasner said Sunday that Wamah's body wasn't immediately discovered by police because of an error.

Krasner's office said it appears that Carriker killed Wamah approximately 44 hours earlier.

TWO IN CUSTODY AFTER BALLISTIC VEST-WEARING SUSPECT KILLS 5, INJURES 4 IN PHILADELPHIA MASS SHOOTING

"It has been determined through information received through a source and corroborated by the Philadelphia Medical Examiner’s Office and additional evidence; that homicide victim Joseph Wamah, Jr. was killed by suspect Kimbrady Carriker approximately 44 hours before the mass shooting," the DA's office said in a statement.

Philadelphia police responded to a 911 call reporting gunshots at about 2 a.m. on July 2 on South 56th Street, which was about an hour and a half after police now believe Wamah was killed. 

Wamah was not immediately located because police were mistakenly dispatched to North 56th Street.

"The grieving family of the deceased has been briefed on this new information, and I cannot express enough the sorrow I feel," Krasner said.

PHILLY DA KRASNER SAYS MASS SHOOTING SUSPECT KIMBRADY CARRICKER TARGETED ‘RANDOM’ VICTIMS, WAS READY FOR FIGHT

The four killed in the shooting on the Fourth of July were all men between the ages of 15 and 59, according to police. A 2-year-old and a 13-year-old were injured by gunfire while another 2-year-old and a woman were wounded by shattered glass.

The shooting in southwest Philadelphia was the worst violence across the country on the holiday.

The Associated Press contributed to this report.

Inventor Nikola Tesla was born on this day in history, July 10, 1856, in what is now Croatia. 

Tesla's father was a priest in the Serbian Orthodox Church, notes Encyclopedia Britannica. 

His mother, while uneducated, was "highly intelligent." 

The younger Tesla took a keen interest in science at a young age. Around the age of six, he started to conduct experiments, according to the website for the Tesla Science Center at Wardenclyffe in New York.

ON THIS DAY IN HISTORY, JULY 9, 1828, AMERICAN PAINTER GILBERT STUART DIES AT AGE 72 

"His keen interest in nature and the way things work, combined with intelligence and curiosity, led to childhood inventions such as a motor powered by June bugs, air piston gun and frog-catching device," said the website.

"In elementary school he built water turbines and dreamed of using Niagara Falls to generate power, a dream that he saw come to life in 1896," the site added.

As a young adult, Tesla worked at the Budapest Telephone Exchange and at a job installing lights in Paris. 

At both of these jobs, Tesla was able to invent improvements to existing technology.

In Budapest, Tesla "improved the equipment and developed an amplifier" — while in Paris, "Tesla made improvements to Edison’s dynamos and created an automatic regulator," said the Tesla Science Center. 

ON THIS DAY IN HISTORY, AUGUST 12, 1877, THOMAS EDISON INVENTS THE PHONOGRAPH

Tesla would move to the United States in 1884, at the age of 28. 

He arrived in New York City "with four cents in his pocket," said the website Tesla Universe.

That same year, Tesla met Thomas Edison. 

Edison "essentially hired Tesla on the spot" and put him to work on the electrical system of the ocean liner "Oregon," the first ship with electric lighting. 

"The set of dynamos that powered the ship were badly damaged and Edison was amazed to learn that Tesla had repaired him," said Tesla Universe. 

Tesla and Edison's relationship would deteriorate the following year, said Tesla Universe, reportedly after Edison reneged on an offer to pay Tesla $50,000 for improving Edison's direct current generator. 

Despite Tesla's work to improve the generator, Edison refused to pay him, reportedly saying, "You don't understand our American humor." 

Among Tesla's notable achievements are patents for the alternating-current dynamo, transformer, and motor, said Encyclopedia Britannica. 

Those patents were sold to George Westinghouse in May 1888. 

ON THIS DAY IN HISTORY, JUNE 10, 1752, BENJAMIN FRANKLIN FAMOUSLY FLIES KITE DURING THUNDERSTORM

"The transaction precipitated a titanic power struggle between Edison’s direct-current systems and the Tesla-Westinghouse alternating-current approach, which eventually won out," said Encyclopedia Britannica. 

In 1891 — the same year he became a U.S. citizen — Tesla invented the "Tesla coil," "an air-core transformer with primary and secondary coils tuned to resonate," according to California State University, Long Beach. 

"Tesla conceived it to be a means to transmit electrical power without wires," said the same source.

Eventually, Tesla would acquire nearly 300 patents throughout his life, said the Tesla Science Center. 

He was particularly interested in the concept of a wireless energy transmission system.

In his later years, he reportedly became rather eccentric, and had a fixation on the pigeons that lived near his hotel.

Despite his lasting impact on electricity as we know it, Tesla himself died in debt and alone on Jan. 7, 1943, in the hotel room where he lived, said Tesla Universe. 

ON THIS DAY IN HISTORY, MARCH 10, 1876, ALEXANDER GRAHAM BELL MAKES FIRST TELEPHONE CALL FROM BOSTON LAB

In the modern era, the name Tesla is most commonly associated with a brand of electric cars.

Tesla, Inc. was founded as Tesla Motors in 2003 by entrepreneurs Martin Eberhard and Marc Tarpenning, notes Encyclopedia Britannica. 

Elon Musk joined the company the following year — and became its largest shareholder. 

The company was named in honor of Nikola Tesla, inventor of the AC motor that powers the company's cars. 

Tesla Motors produced its first car, the Roadster, in 2008 — and in October 2008, Musk was named CEO. 

In 2010, the company went public. 

Production of the Roadster ceased in 2012, said Encyclopedia Britannica, and the company changed its name to Tesla, Inc. in 2017.

CLICK HERE TO SIGN UP FOR OUR LIFESTYLE NEWSLETTER

Now, the company sells several models of cars–Model S, Model 3, Model Y, and Model X–along with solar panels and the "Powerwall." 

The Powerwall is a battery system that can power a home in case of a power outage, says its website.