Co-workers arrested in cocaine-fueled shooting of 28-year-old Fort Worth man
Police have arrested two suspects in the June 15 fatal shooting of a 28-year-old man at an east Fort Worth home after an argument that involved cocaine use, according to an arrest warrant affidavit obtained by the Star-Telegram.
Seth Murray, 34, and Nicholas Grisaffi, 35, were arrested Tuesday, July 1. Both face murder charges.
Murray and Grisaffi are also charged with tampering with physical evidence with intent to impair, according to jail records.
Officers responded to a call about the shooting shortly after 9 a.m. on June 15, near the 6500 block of Routt Street, just north of E. Lancaster Avenue. When officers arrived they found 28-year-old James Lynn Marshall with gunshot wounds to his torso in the back yard of a house in the 3000 block of Forest Avenue, which intersects with Routt.
Marshall had gunshot wounds on his chest and the right side of his abdomen and was pronounced dead at the scene by medical personnel, police said.
A witness who was present during the shooting provided a statement to homicide detectives that led to the arrests, according to the affidavit.
Marshall, Murray and Grisaffi previously worked together at a car dealership. On the night of the shooting, they met at Marshall’s home, where they were drinking beer and “snorting cocaine,” the witness told police. At some point, the men began waving their guns around, according to the affidavit.
Marshall and Murray began to wrestle, and it turned aggressive, the witness told detectives. While outside, Murray slammed Marshall onto a concrete walkway, causing abrasions to his forehead, according to the affidavit.
When Murray, Grisaffi and the witness were trying to drive away, Marshall opened the passenger-side door where Murray was sitting. The witness told detectives he then heard two gunshots, the affidavit states.
The witness told police he didn’t see Marshall with a gun when Marshall opened Murray’s door, and the witness believes Murray shot Marshall, according to the affidavit.
Based on his position in the Tahoe, the witness said he never saw Grisaffi fire a gun, further leading him to believe Murray shot Marshall as they were leaving the area, according to the affidavit.
Murray told the witness not to say anything and kept saying “we’re good,” the witness said. After Marshall was shot and killed, they drove to an Airbnb in Arlington, according to the affidavit.
Police wrote in the affidavit that Grisaffi faces a murder charge because he drove Murray away from the scene and did not report the shooting. Detectives said they contacted the suspects’ attorneys but have not received a statement from either suspect.
Marshall was described in his obituary as a loyal son, loving brother, hardworking professional, and proud father. He was known as the “word man,” “always keeping everyone informed with the latest updates, delivered with charm and flair.”
“Fatherhood came naturally to him. He was proud, protective, and deeply devoted to his son,” according to the obituary.
This story was originally published July 1, 2025 at 7:20 PM.