Three relatives of a slain 75-year-old Woodbridge man have been charged with accessory to murder, and police said they think the trio was after the man’s $1  million life insurance policy, Prince William County authorities said Monday.

Prince William police said the three — one of whom was arrested Friday at Newark Liberty International Airport, where he was about to board a flight to Beijing — “had a part” in the killing of Kwang Sup Hur. No one has been charged with murder.

Hur’s wife discovered his body about 11:30 p.m. Sept. 1 after she returned home from work. The pair lived in the River Run apartment complex in the 13900 block of Hedgewood Drive.

Authorities said Hur had been strangled.

Hur’s brother-in-law, Jung Min Jun, 58; sister-in-law, Jung Ok Jun, 56; and nephew, Ho Young Jun, 26, all of Fresh Meadows, N.Y., were arrested.

Prince William Commonwealth’s Attorney Paul B. Ebert said it is “very likely” that charges against one suspect would be upgraded to murder, but he declined to elaborate. Authorities said all three would have benefitted from Hur’s life insurance policy.

“I’ve been in this business a long time; as soon as you think you’ve seen it all, you see something else,” Ebert said.

Authorities released few additional details about the alleged plot to kill Hur. But Prince William Police Chief Charlie T. Deane said he wanted to announce the arrests because residents at the apartment complex have been “very concerned” about their safety.

Authorities said the investigation took on urgency last week when they were seeking to interview Jung Min Jun. After sharing details of the case with Immigration and Customs Enforcement, police said, they learned that Jun was at the airport.

Ebert said Jun was trying to flee the country to avoid arrest.

After Jun was taken into custody, the investigation took off, police said. Five Prince William detectives and a crime scene analyst went to Newark and New York, and identified the other suspects. A second suspect was arrested Friday, and police found the third Sunday.

Authorities said one of the suspects is wanted for embezzlement in Fairfax County, but did not say who.

The three suspects were being held in the New York area, authorities said. An extradition hearing was scheduled for Wednesday.