  We compute the entanglement negativity for various pure and mixed state
configurations in a bath coupled to an evaporating two dimensional non-extremal
Jackiw-Teitelboim (JT) black hole obtained through the partial dimensional
reduction of a three dimensional BTZ black hole. Our results exactly reproduce
the analogues of the Page curve for the entanglement negativity which were
recently determined through diagrammatic technique developed in the context of
random matrix theory.
