U.S. marshals reported they’ve arrested one of two fugitive brothers suspected in the presumed slayings of an Arlington couple. The other brother, John Blaine Reed, remains at large.

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One of two fugitive brothers wanted in connection with the presumed slayings of an Arlington couple in April turned himself in to U.S. Marshals on Monday night.

Tony Clyde Reed, 49, was booked into San Diego County Jail after arranging with the marshals to surrender, according to the Snohomish County Sheriff’s Office.

Investigators think he fled with his brother, John Blaine Reed, 53, to Ellensburg and then Mexico after Patrick Shunn, 45, and his wife, Monique Patenaude, 46, were killed, according to the office.

Tony Reed surrendered around 7:45 p.m. at the San Ysidro Port of Entry, according to Supervisory Deputy U.S. Marshal Raymond Fleck in Seattle. He said Reed had made arrangements to surrender through an attorney.

John Reed, who remains at large, lived next to the couple. The couple was reported missing April 12. The Sheriff’s Office continues to seek tips on his whereabouts, sheriff’s spokeswoman Shari Ireton wrote in a news release late Monday.

No bodies have been found, Ireton said, and crews over the weekend continued to search rough ground in the Oso area, where the victims’ cars were found abandoned April 14.

Court records outline long-running hostilities between neighbors that may have led to the couple’s disappearance. Neighbors reported Shunn and Patenaude missing after finding their livestock untended. Shunn went to work April 11, but he failed to show up the next day. Patenaude was last seen about 1 p.m. on April 11 near the couple’s home in the 27800 block of Whitman Road, near the site of the Oso landslide.

Authorities contend the brothers are tied to the couple’s presumed slayings by a variety of evidence, including blood and other items recovered from where the couple’s vehicles were found. Investigators think Tony Reed helped his brother in the killings.

Investigators have obtained several search warrants and court orders. Among them are court orders freezing bank accounts of the brothers’ parents in Ellensburg, whom authorities say were given at least $96,000 in cashier’s checks by John Reed before he fled the state.

Other warrants allow investigators to search septic systems, wells and other areas of the missing couple’s property and John Reed’s former land. Investigators also have received permission to search another neighbor’s property, from which detectives previously recovered a shotgun and all-terrain vehicle apparently left by John Reed.

Another warrant allows detectives to recover evidence from the all-terrain vehicle that authorities say the brothers may have used when disposing of the couple’s bodies.

A judge signed each of the warrants and orders in recent weeks.