Authorities have identified the man found stabbed to death Saturday night inside his Revere mobile home and the suspect charged in his murder, a spokesman for the Suffolk District Attorney’s office said.

The body of Ronald Russo, 50, of Winthrop was discovered at 418 Revere Beach Parkway around 8:30 p.m., according to a statement from Suffolk District Attorney spokesman Jake Wark , and soon after, 56-year-old Peter Deconink, of Revere, was arrested at the Beachmont MBTA station.

When authorities apprehended Deconink, he had blood on his clothing and a laceration to his hand, Wark said in the statement. Investigators believe Deconink had stabbed Russo in the course of an altercation, according to the statement.

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Russo’s body was discovered by a longtime friend, who lives nearby and had come over to seek his help loading a washing machine into his truck.

“I got up to the third step and saw the door wide open,” said the man, who requested anonymity, on Saturday night at his kitchen table while his dog barked beside him.

Because Russo rarely left his home at Lee’s Trailer Park without his 2005 Cadillac, which was still parked outside, he felt something may have happened.

After standing at the door and calling for the man he had known for 30 years, he said, he entered and saw a grisly scene, with blood drenching the floor, furniture, and walls.

“I have seen a lot of dead bodies; taken locks off doors, and gone in, and found them,” he said. “But this time, all I had to do was walk right in and what I saw was just horrific.”

The man said he was also acquainted with Deconink.

After a chaotic night of police and media flooding the trailer park, the yellow tape that had surrounded Russo’s mint green and white mobile home was gone. Children played in the small roads around their homes and families barbecued.

A 54-year-old man who lives around the corner from Russo’s mobile home said he didn’t know the victim but was happy police had arrested a suspect.

“I can’t explain how quiet it usually is around here,” he said. “It is a family place, really,”

Deconink is scheduled be arraigned Monday in Chelsea District Court, according to Wark.