The son of an 87-year-old Arlington man has been arrested and charged, along with two others, in the elderly man's death.

Mack L. Wood Sr. was found dead inside his home in October, and Arlington County police immediately listed the death as "suspicious."

Now they say it's murder.

Arrested were the victim's son, Mack Leon Wood Jr., 47, and two other men, Jean Caleb Pierre, 32, and Sapien Edmonds, 29. All three men are from Henrico, Va. All three were charged with first-degree murder.

"Our homicide detectives did a fabulous job, spending countless hours on this case," said Arlington County police spokesman Dustin Sternbeck.

Sternbeck wouldn't provide any details about the case Tuesday or how Wood Sr. was killed. An official with the office of the medical examiner said the cause of death remains pending and that it can take up to 14 weeks to determine.

Wood was picked up Monday in Tampa, Fla. Pierre and Edmonds were arrested Saturday morning in Henrico County.

On Tuesday, Arlington County police detectives flew to Florida to interview Mack, Sternbeck said. Wood had gone to Florida to visit with family, he said.

The investigation began Oct. 13, 2012, the morning Wood Jr. said he found his dead father at the man's home on the 3700 block of North Wakefield Street. The son reported the death as accidental, police said.

After an extensive investigation, Sternbeck said, including a review of evidence, forensic examination and consultation with the Office of the Chief Medical Examiner, police determined Wood Sr.'s death to be a homicide.

Police obtained arrests warrants for all three men last week.

All three suspects were being held without bond Tuesday, awaiting extradition to Arlington County.