WAYLAND (CBS) – Dozens of police were back in a marshy area of Wayland near the town beach Friday morning, searching for more evidence in the murder of 18-year-old Lauren Astley.

Her body was found in a marsh off river road on Monday.

WBZ-TV’s Karen Anderson reports

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Her ex-boyfriend, 18-year-old Nate Fujita, is being held without bail in the killing.

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When asked why they had returned to the scene, Wayland Police Chief Robert Irving told WBZ NewsRadio 1030, “It’s a routine search to ensure they’ve found every bit of evidence in the case.”

By the end of the day, police had collected at least two bags of evidence.

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Investigators aren’t commenting on what’s inside these bags, new evidence collected Friday as part of the case.