A Maryland man was charged in connection with the killing of a former FBI agent found dead in March under a woodpile and a plastic tarp outside his home.

Jason Byrd, 42, was arrested Monday after police say he was part of a conversation over texts in which the victim’s estranged wife thanked Byrd for being her “muscleman.”

The exchange occurred March 16, shortly before the body of Scott Alan Horn, 62, was discovered, charging papers said.

Byrd’s arrest comes about a week after Horn’s wife, Anne Allen, 62, was charged with murder in the case. Byrd and Allen were in a romantic relationship, charging papers said.

The case stems from March 16, when Horn’s children reported him missing, police said. Horn’s son later discovered his father’s body under a tarp and a pile of firewood in the yard of his home about 9 p.m. in the 200 block of Patuxent Road in Laurel, police said.

Anne Allen (Laurel Police)

Though police did not detail the role Byrd allegedly played in the killing, charging papers said Byrd and his truck were spotted at the home the day Horn was discovered dead.

Police said Byrd received the text from Horn’s estranged wife thanking him while police were investigating Horn’s disappearance.

Byrd, of Westminster, was charged with first-degree murder, second-degree murder, conspiracy to commit murder and the use of a handgun in a crime of violence, according to Laurel police.

Online records do not list an attorney for Byrd, who is jailed.

Police said they had been developing evidence and their case in Horn’s slaying since March, leading to Allen’s and Byrd’s arrests this month.

Allen and Horn were in the middle of a divorce, court records show. The couple had a history of domestic violence allegations between them, according to police and court records.

Allen accused Horn of treating her “consistently cruelly and unconscionably both physically and emotionally,” divorce papers state.

Horn, accused Allen of assaulting him and said she “repeatedly and maliciously filed false criminal accusations against” him, according to divorce filings he made.