Investigators combed the marsh in Wayland where the body of 18-year-old Lauren Astley was found on the Fourth of July, Boston.com reported.
A spokeswoman for Middlesex District Attorney Gerard T. Leone Jr. did not say what police were looking for.
Astley graduated from Wayland High School only a few weeks ago. Her ex-boyfriend, Nathaniel Fujita, has been charged with killing her, possible in his family’s garage, by cutting her throat and wrapping a bungee cord around her neck.
Fujita, also 18, pleaded not guilty earlier this week to first degree murder.