Police found a pile of bloody clothing that an accused killer who was arrested while running naked through a Virginia town allegedly wore when he slaughtered three members of his family last month, according to a report Friday.

Mathew Thomas Bernard, 18, was arrested while wearing no clothes by state police on Aug. 27 in the town of Keeling, where the bodies of his mother, sister and 14-month-old nephew were discovered hours earlier.

Police found a set of bloody clothing one day later in a wooded area roughly one mile from the family’s home, indicating that Bernard — who has been charged with three counts of first-degree murder — was clothed during the slayings of his mother, Joan Bernard, 62; his sister, Emily Bivens, 25; and 14-month-old nephew Cullen, according to a search warrant obtained Friday by the Chatham Star-Tribune.

The blood-stained items found on the ground included a white T-shirt, blue sweatpants and Nike sneakers, the warrant shows.

“The clothing appeared to have red stains and what could possibly be particles of human tissue on them,” the document states.

A rifle was also found about 100 yards from the family’s home, according to the warrant, as well as a sledgehammer that was covered in blood, a criminal complaint shows.

Authorities have yet to provide a motive in the triple homicide, but his cousin has said that he snapped after reaching a “breaking point” in his struggles with mental health issues.

He was set to appear in court last week, but the hearing was canceled after he was hospitalized due to an undisclosed reason, WSET reported.

Police have said that Bernard banged his head against the cage of a police cruiser after being taken into custody. He was later placed on suicide watch. Bernard is now set to be arraigned on Thursday, according to the Chatham Star-Tribune.

Bernard is the brother-in-law of Blake Bivens, a pitcher for the Tampa Bay Rays’ Double-A affiliate, Alabama’s Montgomery Biscuits.

Two days after the grisly slayings, Bivens wrote on Instagram that his heart had “turned to ash” and that the pain of losing his wife, Emily, son and mother-in-law was unbearable.

Emily Bivens (center) holds her son, Cullen, as she poses with her mother, Joan Bernard.