The RCMP dive searched the water under the Battle River bridge just west of the Samson Cree First Nation town site.
Chelsea Yellowbird was found shot to death in her home on the First Nation on Sept. 5, 2011.
The house is next door to where her nephew, five-year-old Ethan Yellowbird, was shot dead while sleeping earlier in 2011.
Police believe in both cases, the shots came from outside the homes, and they suspect gangs.
Hobbema RCMP are re-examining previously collected evidence, thanks to new technology and advances in science.
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