Lioness at Indianapolis Zoo kills her longtime mate

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<pThe Indianapolis Zoo is trying to determine why a lioness killed her mate.

<pThe zoo said Friday that an adult female, Zuri, attacked 10-year-old male Nyack in their outdoor yard Monday before the zoo opened for the day.

<pThe zoo says the two had been housed together for eight years and produced three cubs in 2015. Nyack was on loan from the San Diego Zoo.

<pIt says that staff heard an unusual amount of roaring from the yard and tried to separate the two but that Zuri held Nyack by the neck until he stopped moving. A necropsy confirmed Nyack died of suffocation from injuries to his neck.

<pThe zoo says daily logs kept by staff previously showed no unusual aggression, injuries or wounds between the two.