Tony Clyde Reed turned himself in last week near the U.S.-Mexico border. He and his brother, John Blaine Reed, are charged in the presumed slayings of John Reed’s neighbors, Patrick Shunn and Monique Patenaude.

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One of two brothers charged in connection with the presumed slayings of an Arlington couple in April is scheduled to be arraigned at 1 p.m. Tuesday in Snohomish County.

According to the county prosecutor’s office, Tony Clyde Reed made arrangements through an attorney to surrender last week to U.S. Marshals at the San Ysidro Port of Entry near the U.S. -Mexico border, according to Supervisory Deputy U.S. Marshal Raymond Fleck in Seattle.

Reed and his brother, John Blaine Reed, 53, are suspects in the presumed killings of Patrick Shunn and Monique Patenaude, who were reported missing after they were last seen April 11.

The burned-out vehicles of Shunn, 45, and Patenaude, 46, have been found, but their bodies have not, according to the Snohomish County sheriff’s office.

John Reed, who is still at large, was a neighbor of Shunn and Patenaude and reportedly was involved in an “ongoing and constant” dispute with the couple, court documents allege.

Tony Reed, 49, was booked into San Diego County Jail on May 16 after his surrender, according to the Snohomish County sheriff’s office.

Investigators think he fled with John Reed to Ellensburg and then Mexico after the killings, according to the sheriff’s office.

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 failed to show up the next day. Patenaude was last seen about 1 p.m. April 11 near the couple’s home in the 27800 block of Whitman Road, near the site of the Oso landslide.

Authorities contend that a variety of evidence, including blood and other items recovered from where the couple’s vehicles were found, ties the brothers to the couple’s presumed deaths.