NEW ORLEANS — Prosecutors say a 29-year-old woman has been sentenced for obstructing justice in the drownings of a couple who were beaten, bound, and thrown alive into a shipping canal with 30-pound weights tied to their ankles.

District Attorney Leon Cannizzaro’s office says Brittany Martin was sentenced Wednesday to 10 years in prison, with five years suspended, for her part in the 2014 killings of Kenneth and Lakeitha Joseph of Reserve.

Martin testified against ex-boyfriend Horatio Johnson and a second man as part of a plea deal. Cannizzaro says her testimony was crucial.

Martin had met Johnson when she was a state prison guard and he was serving time for manslaughter.

He’s now serving consecutive life terms for second-degree murder plus 60 years for obstructing justice and conspiring to do so.

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