An Ohio truck driver has been arrested in Connecticut on charges that he murdered his wife and three other relatives this past April, authorities said Tuesday.

Gurpreet Singh, 37, was being held in New Haven County pending extradition to Ohio to face four aggravated murder charges, West Chester Township Police Chief Joel Herzog said. He did not say why Singh was in Connecticut.

The Branford, Conn. police department said in a statement on Facebook that West Chester Police had notified them that Singh was staying at a local residence. The suspect was arrested in a Wal-Mart parking lot at 2 p.m., shortly after leaving the home.

Singh called 911 on April 28 to say he found the four “on the ground and bleeding” in a West Chester apartment where he lived. The victims were later identified as Shalinderjit Kaur, 39; Amarjit Kaur, 58; Parmjit Kaur, 62, and Hakiakat Singh Pannag, 59. The Butler County coroner said all four died from gunshot wounds to the head and each victim was shot at least twice.

In the aftermath of the slayings, Singh that he and Shalinderjit Kaur had been married for 17 years and had three children. Family members identified Parmjit Kaur and Hakitakat Singh Pannag as his wife’s parents and Amarjit Kaur as Parmjit’s sister. Members of a nearby Sikh temple said the four had worshipped there.

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Singh and Kaur's children were staying with other relatives at the time of the slayings and police said Tuesday they were safe but wouldn't say where they were.

Violent crime is rare in West Chester, a township of some 62,000 people approximately 20 miles north of Cincinnati. Butler County Prosecutor Mike Gmoser declined to discuss details of the investigation, saying the case will be presented to a grand jury, which could help determine whether the suspect would face the death penalty upon conviction.

"This process is complicated and takes time. Preserving the integrity of this case is crucial to the process. The men and women of the West Chester Police Department showed true professionalism to their commitment to bring Gurpreet Singh to justice," Herzog said, according to FOX19. "West Chester is a safe community."

“There will be a day of reckoning in this case,” Gmoser said.

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Authorities spoke at a lectern with a poster showing the four victims and the message: "Forever in our hearts."

Fox19 reported that Singh was questioned as a witness the night of the murders, but was not taken into custody at the time. Investigators combed the apartment complex for clues. At one point, divers recovered a gun from a pond behind the building where the murders took place. However, authorities have not confirmed that the gun was used in the killings.

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The Associated Press contributed to this report.