>> RELATED: Mental evaluation sought for accused Warren County shooter
Laghaoui is accused of shooting his father and Deputy Katie Barnes before throwing the gun in the nearby lake.
“We’re trying to make sure we’ve exhausted every possible way,” said Major Steve Arrasmith, chief investigator.
The non-profit team, based in Moro, Ill., works at no charge. It is expected work Wednesday in Warren County before heading to another underwater search.
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